]> 2008/06/10 OpenCyc Knowledge Base Copyright© 2001-2008 Cycorp, Inc., http://www.cyc.com/, Austin, TX, USA This file contains an OWL representation of information contained in the OpenCyc Knowledge Base. The content of this OWL file is licensed under the Creative Commons Attribution 3.0 license whose text can be found at http://creativecommons.org/licenses/by/3.0/legalcode. The content of this OWL file, including the OpenCyc content it represents, constitutes the "Work" referred to in the Creative Commons license. The terms of this license equally apply to, without limitation, renamings and other logically equivalent reformulations of the content of this OWL file (or portions thereof) in any natural or formal language, as well as to derivations of this content or inclusion of it in other ontologies. externalID A unique, language-neutral, variable-sized identifier for a concept that can be used to refer unambiguously to that concept across OWL exports or across Cyc inference engines. label A natural-language representation for a concept that is both human readable and readable by the Cyc inference engine. These terms are not guaranteed to refer to the same concept across time but are guaranteed to be consistent within a particular OWL export. Use 'cycAnnot:externalID' for unambiguously referring to a concept across OWL exports or across Cyc inference engines. natural feature type NaturalFeatureType <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a> is the collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r6-wc8BKxEdeIXwCgydofLQ" class="cyc_term">CartographicFeatureType</a>s which naturally occur on the surface of the Earth. Positive examples include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjktpwpEbGdrcN5Y29ycA" class="cyc_term">Ocean</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD8VZwpEbGdrcN5Y29ycA" class="cyc_term">Mesa</a>. Negative examples include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjzt5wpEbGdrcN5Y29ycA" class="cyc_term">WaterReservoir</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjzcZwpEbGdrcN5Y29ycA" class="cyc_term">Canal</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rT2uByCTVQdeVZZaE0030Zg" class="cyc_term">Airfield</a>. Also see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ru-8ymLHtEdmAAAACs6hO_g" class="cyc_term">ArtifactualFeatureType</a>, the corresponding collection for feature types which are <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkH_ZwpEbGdrcN5Y29ycA" class="cyc_term">Artifact</a>s. WetlandType wetland terrain attribute A collection of collections. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rXw3TnHSuEdaAAACgyZzFrg" class="cyc_term">WetlandType</a> is a type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvh8GOpwpEbGdrcN5Y29ycA" class="cyc_term">WetlandRegion</a>. Instances include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r5CaXyLgpEdmAAAACs0x8nw" class="cyc_term">SaltMarsh</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQwnxpwpEbGdrcN5Y29ycA" class="cyc_term">Swamp</a>. RegionTypeBySoilType terrain attribute soil A collection of collections. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rkrWl-HSuEdaAAACgyZzFrg" class="cyc_term">RegionTypeBySoilType</a> is collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViACZwpEbGdrcN5Y29ycA" class="cyc_term">GeographicalRegion</a>s having a common soil type. slope gradient level A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rHQdVmB_TEdaAAABQ2rksLw" class="cyc_term">SecondOrderCollection</a> instances of which are subcollections of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a> that are grouped according to their level of slope. More specifically, with the exception of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rEFD3knS-EdaAAACgyZzFrg" class="cyc_term">Slope_FlatGradient</a> (q.v.), each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rBrxsOnSuEdaAAACgyZzFrg" class="cyc_term">SlopeTypeByGradientLevel</a> is a specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rw4--UiTfQdeTAd3NPZMGfg" class="cyc_term">Slope_Topographical</a> (q.v.). SlopeTypeByGradientLevel A collection of collections. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4re_D7JHSuEdaAAACgyZzFrg" class="cyc_term">RegionTypeByHilliness</a> is a collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViACZwpEbGdrcN5Y29ycA" class="cyc_term">GeographicalRegion</a>s with a common degree of hilliness. hilliness RegionTypeByHilliness A collection of collections. Each <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r86oPXkf8EdaAAABQ2rksLw" class="cyc_term">RegionTypeBySurfaceGrowth</a> is a specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViACZwpEbGdrcN5Y29ycA" class="cyc_term">GeographicalRegion</a> distinguised by the type of surface growth it has (which, in turn, is typically a function of the region's climate). See also <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r9CKXvEf8EdaAAABQ2rksLw" class="cyc_term">FixedTerrainGeologicalRegion</a>. type of terrain classified by surface growth RegionTypeBySurfaceGrowth Cave A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rWlYxOnS_EdaAAACgyZzFrg" class="cyc_term">Underground</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvdzSmpwpEbGdrcN5Y29ycA" class="cyc_term">CavityWithWalls</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViDMJwpEbGdrcN5Y29ycA" class="cyc_term">Cave</a> is a natural, hollow passage under the surface of the Earth, typically with an opening to the surface. cave NaturalRegion natural region A region which is in a natural state, not obviously affected by the activities of humankind - there are no or very minimal human structures present, and the land is not used for agriculture, mining, or other human activities which disrupt the natural plants and wildlife. A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHdJwpEbGdrcN5Y29ycA" class="cyc_term">Stream</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rd8KghqoEEdqAAAAOpmP6tw" class="cyc_term">Stream_Canalized</a> is a natural stream of water which has been significanly modified by deepening, straightening, or installing dikes. Stream-Canalized stream-canalized a passage through an topographical obstruction (e.g., mountains) Pass-Geographical mountain pass Draw-Topographical draw The collection of all draws. A type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rlPnqHO0SQdeG8JKGfllsLg" class="cyc_term">MinorTerrainFeature</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvn7CU5wpEbGdrcN5Y29ycA" class="cyc_term">NaturalThing</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rxX6p7O0OQdeXqZjCrR0jsg" class="cyc_term">TerrainLowGround</a>. The collection <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rt7QVxgMwQdiJvtc6JMmHjA" class="cyc_term">Draw_Topographical</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r3DIuwO0OQdeFmbzex52KAQ" class="cyc_term">MilitaryMinorTerrainType</a>, a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a>, and an <font color="#ff0000">#$RKF-SME-TerrainType</font>. taiga ecosystem TaigaEcosystem The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s characterized by taiga ecology. Instances feature rainfall that normally averages between 20 and 60 cm. a year, with acidic soil. Coniferous forest predominates. (CollectionDifferenceFn (SubcollectionOfWithRelationFromTypeFn Basin-Topographical covers-Paintlike Asphalt) Artifact) Subcollection Of With Relation From Type Fn geological basin Covers-Paintlike asphalt that is not an artifact Savannah A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEAo5wpEbGdrcN5Y29ycA" class="cyc_term">Grassland</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwSIj25wpEbGdrcN5Y29ycA" class="cyc_term">Savannah</a> is an area in which grasses are interspersed with scattered thorn bushes or deciduous trees. Savannahs are found to the north and south of the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwFq7W5wpEbGdrcN5Y29ycA" class="cyc_term">TropicalRainForest</a> regions of South America and central Africa and around the desert fringes of Australia. grassland with some scrub growth The collection of topographical features where each element is a a small plain on Earth's moon. lunar palus Palus-Lunar (CollectionSubsetFn Basin-Topographical (TheSetOf ?BAS (thereExists ?BOW (and (isa ?BOW BodyOfWater-Intermittent-DryPhase) (basinOfBodyOfWater ?BAS ?BOW))))) geological basin in the set of ?BAS such that ?BAS is the basin of some intermittent body of water in a dry phase CraterRim crater rim The collection of all crater rims. A type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPvAs5wpEbGdrcN5Y29ycA" class="cyc_term">Rim_Topographical</a>. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwOVEyZwpEbGdrcN5Y29ycA" class="cyc_term">CraterRim</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a>. foothill Foothill A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEUypwpEbGdrcN5Y29ycA" class="cyc_term">Hill</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD65JwpEbGdrcN5Y29ycA" class="cyc_term">Foothill</a> is a hill near the base of a mountain or mountain range. TalusSlope A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rYQITWHS8EdaAAACgyZzFrg" class="cyc_term">Slope_HighGradient</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r6xve9LrAEdqAAAACs6hnmQ" class="cyc_term">TalusSlope</a> is a steep, concave slope formed by the accumulation of loose rock fragments at the base of a steep slope. talus slope VerticalProtrusion-Topographical A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwS7huJwpEbGdrcN5Y29ycA" class="cyc_term">Protrusion</a> (qq.v.). Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rIp032uHpEdmAAAACs0uFOQ" class="cyc_term">VerticalProtrusion_Topographical</a> is a natural, upward protrusion from the surrounding part of the Earth's surface. Specializations of this collection include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEUypwpEbGdrcN5Y29ycA" class="cyc_term">Hill</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a>. vertical protrusion topographical hot spring HotSpring A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgESBJwpEbGdrcN5Y29ycA" class="cyc_term">Spring_WaterSource</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rQY8ZfoPDEdaAAAACs0uFOQ" class="cyc_term">HotSpring</a> is a place from which a small stream of fresh water, warmed geothermally underground, flows. A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rh28noOGnEdmAAAACs0uFOQ" class="cyc_term">Slope_Vertical</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPu77JwpEbGdrcN5Y29ycA" class="cyc_term">Wall_Vertical</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjU5pwpEbGdrcN5Y29ycA" class="cyc_term">Cliff</a> is a very steep, vertical or overhanging face on a mass of rock, earth, or ice. Cliff cliff DesertEcosystem The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s characterized by high desert ecology. Instances feature rainfall that is usually less than 25 cm. a year, with sandy soil. Cacti and and other low-water-adapted vegetation predominate. desert ecosystem The collection of topographical features where each element is a very large dark area on Earth's moon. Oceanus-Lunar lunar oceanus A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv00j95wpEbGdrcN5Y29ycA" class="cyc_term">Crevice_Topographical</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjVKJwpEbGdrcN5Y29ycA" class="cyc_term">Gorge</a> is a deep, narrow, steep-walled passage. Also known as a <i>ravine</i>. gorge Gorge A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPzfTJwpEbGdrcN5Y29ycA" class="cyc_term">Crevice</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViduZwpEbGdrcN5Y29ycA" class="cyc_term">Fault_Topographical</a> is a fracture in the Earth's crust in which the adjacent surfaces are displaced with respect to each other in a direction parallel to the fracture. Faults are caused by a shifting or dislodging of the Earth's crust. Energy release during rapid slippage along faults causes earthquakes (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQBYpZwpEbGdrcN5Y29ycA" class="cyc_term">Earthquake</a>). Fault-Topographical geological fault (FieldFn WheatPlant) wheatfield The collection of all wheatfields. A type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQr0p5wpEbGdrcN5Y29ycA" class="cyc_term">Field_Agricultural</a>. flat area A relatively level area within a region of greater relief. Examples include forest clearings, mountain terraces, playas, and mesas. Flat-Topographical TropicalRainforestEcosystem The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s characterized by tropical rainforest ecology. Instances feature rainfall that normally averages between 200 and 400 cm. a year, and the soil is of relatively poor quality. Characteristic vegetation includes tall trees with few lower limbs, vines, and epiphytes. tropical rainforest ecosystem cove The collection of all coves. A type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi1YJwpEbGdrcN5Y29ycA" class="cyc_term">Bay</a>. The concept <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rG28AGiTbQdeR8YLno_5fww" class="cyc_term">Cove</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a> and a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rrwTJ-v7BEdmAAAACs0uFOQ" class="cyc_term">WaterBodyConcept</a>. Cove A specialization of Ridge-Hill. Each <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rZeSXggnoEdqAAAACs0x8nw" class="cyc_term">BeachRidge</a> is found on a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv2NrtpwpEbGdrcN5Y29ycA" class="cyc_term">SandyBeach</a>. beach ridge BeachRidge (CollectionIntersectionFn (TheSet Underwater Valley)) member of { underwater, valleys } Creek A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHdJwpEbGdrcN5Y29ycA" class="cyc_term">Stream</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViptpwpEbGdrcN5Y29ycA" class="cyc_term">Creek</a> is a natural stream of water with a comparatively smaller amount of flow than a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHM5wpEbGdrcN5Y29ycA" class="cyc_term">River</a>. (Note that the distinction between a creek and a river is difficult to specify with any precision.) creek An open body of water forming a slight recession in a coastline bight Bight Stratovolcano A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKUJwpEbGdrcN5Y29ycA" class="cyc_term">Volcano</a> (q.v.) Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rU1HXyjPGEduAAAACs6hRXg" class="cyc_term">Stratovolcano</a> is a tall conical volcano caused by the subduction of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv-KysZwpEbGdrcN5Y29ycA" class="cyc_term">TectonicPlate</a>s. Active stratovolcanoes are characterized by frequent eruptions, with highly viscous lava flows that harden quickly. stratovolcano The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s characterized by chaparral ecology. Instances feature rainfall that averages between 50 and 75 cm. a year, primarily in the winter months, and the soil is stony and relatively infertile. Scrub vegetation predominates. chaparral ecosystem ChaparralEcosystem member of The Set desert the union of The Set gravelly rocky soil region (CollectionIntersectionFn (TheSet Desert (CollectionUnionFn (TheSet GravellySoilRegion RockySoilRegion)))) ecological region EcologicalRegion A collection of geographical regions. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjKJ5wpEbGdrcN5Y29ycA" class="cyc_term">EcologicalRegion</a> is a region having one or more characteristic ecosystems. From knowledge of those ecosystems, we can posit whether certain organisms can forage, reproduce, and live successfully there. Information about ecological regions typically also includes what kinds of organisms are in fact found there. In theory, any arbitrary continuous region could be analyzed as an ecological region, but most regions identified in practice have some kind of sameness or systematic interconnection in their topology, climate, and biology. Examples: the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQBnu5wpEbGdrcN5Y29ycA" class="cyc_term">WesternDesertOfEgypt</a>, the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvr5ZE5wpEbGdrcN5Y29ycA" class="cyc_term">GreatBarrierReef</a>, the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEX1ZwpEbGdrcN5Y29ycA" class="cyc_term">Amazon_Region</a>. ocean trench OceanTrench The collection of all ocean trenches. A type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj1PJwpEbGdrcN5Y29ycA" class="cyc_term">UnderwaterLocation</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvn7CU5wpEbGdrcN5Y29ycA" class="cyc_term">NaturalThing</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>. The collection <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj0vpwpEbGdrcN5Y29ycA" class="cyc_term">OceanTrench</a> is an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rp8poI7hSEdqbdQDggVbyFw" class="cyc_term">UnderseaTerrainFeatureType</a> and a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a>. The collection of all planetary crusts. A type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPuiRJwpEbGdrcN5Y29ycA" class="cyc_term">LandStuff</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvn7CU5wpEbGdrcN5Y29ycA" class="cyc_term">NaturalThing</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a>. The concept <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvWFdZpwpEbGdrcN5Y29ycA" class="cyc_term">PlanetCrust</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a> and an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVny6pwpEbGdrcN5Y29ycA" class="cyc_term">ExistingStuffType</a>. PlanetCrust planetary crust Mountain A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a> is a topographical feature of significantly higher elevation than its surrounding area. Mountains may occur individually or as part of a chain (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjlL5wpEbGdrcN5Y29ycA" class="cyc_term">MountainRange</a>). Instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a> include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViQU5wpEbGdrcN5Y29ycA" class="cyc_term">MountEverest</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj3PJwpEbGdrcN5Y29ycA" class="cyc_term">MountLogan</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwAT-T5wpEbGdrcN5Y29ycA" class="cyc_term">Kebnekaise_Sweden</a>. <p/> See also <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjlL5wpEbGdrcN5Y29ycA" class="cyc_term">MountainRange</a>. mountain The linear region at the edge of an island shelf or continental shelf, at which there is significant increase in negative slope as the ocean floor drops away to deeper water. ShelfEdge-Undersea shelf edge undersea A collection of geographical regions and a specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjORZwpEbGdrcN5Y29ycA" class="cyc_term">TopographicalFeature</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a> is a region of land distinguishable from surrounding regions by salient physical differences in surface texture, three-dimensional shape, or elevation. Note that this collection <i>includes</i> features that are covered by bodies of water, snow, or ice. <p/> Specializations of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a> include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPKjXpwpEbGdrcN5Y29ycA" class="cyc_term">Crater</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkLu5wpEbGdrcN5Y29ycA" class="cyc_term">Continent</a>. Instances include the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjt7JwpEbGdrcN5Y29ycA" class="cyc_term">ArabianPeninsula</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPuYTJwpEbGdrcN5Y29ycA" class="cyc_term">MountZion</a>, the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVid-5wpEbGdrcN5Y29ycA" class="cyc_term">SanAndreasFault</a>, the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVinuJwpEbGdrcN5Y29ycA" class="cyc_term">GreatSmokyMountains</a>, and the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjXxZwpEbGdrcN5Y29ycA" class="cyc_term">JavaTrench</a>. LandTopographicalFeature land topographical feature Mare-Lunar The collection of topographical features where each element is a large circular plain on Earth's moon. mare A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEUypwpEbGdrcN5Y29ycA" class="cyc_term">Hill</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r7lLJhiTVQdeaVoLynwa-Sw" class="cyc_term">Butte</a> is a small, isolated, usually flat-topped hill with steep sides See also <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD8VZwpEbGdrcN5Y29ycA" class="cyc_term">Mesa</a>. Butte buttes An instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHBpwpEbGdrcN5Y29ycA" class="cyc_term">DegreeOfCloudiness</a> and specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjhiJwpEbGdrcN5Y29ycA" class="cyc_term">ClearWeatherArea</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjh9JwpEbGdrcN5Y29ycA" class="cyc_term">CloudlessArea</a> is an instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a> that has no cloud cover. CloudlessArea cloudless location An instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjghZwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocationTypeByWeather</a> and a specialization of both <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHSJwpEbGdrcN5Y29ycA" class="cyc_term">CloudyArea</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rLjNLsvNgQdeTVJUos5k2Dg" class="cyc_term">AdverseWeatherArea</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r0yRMxC0mQdmPK-79ElYBKA" class="cyc_term">StormyArea</a> is an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a> that has moderate or heavy cloud cover and is undergoing moderate to heavy precipitation (in the form of rain, snow, sleet, or hail). StormyArea stormy area Cavus-Topographical cavus topographical generic The collection of all topographical features characterized by irregular steep-sided depressions, usually in arrays or clusters. A hollow is an example of a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvmcCtJwpEbGdrcN5Y29ycA" class="cyc_term">Cavus_Topographical</a>. A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rNJ6veMkuEdmAAAACs6hRjg" class="cyc_term">NaturalElevation</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rr9vWBq63EdqAAAAOpjlAWA" class="cyc_term">Upland</a> is a large region of land away from the sea having a consistently high elevation. A single <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEUypwpEbGdrcN5Y29ycA" class="cyc_term">Hill</a> or <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a> would not be considered an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rr9vWBq63EdqAAAAOpjlAWA" class="cyc_term">Upland</a>. A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjlL5wpEbGdrcN5Y29ycA" class="cyc_term">MountainRange</a> would not be considered an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rr9vWBq63EdqAAAAOpjlAWA" class="cyc_term">Upland</a>, because it varies too much in elevation. upland Upland intermittent body of water in a wet phase Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rU3UIGhTtEdqAAAACs6hfSg" class="cyc_term">BodyOfWater_Intermittent_WetPhase</a> is a region which often is inundated with a relatively large volume of stationary or flowing water, and which in fact has water present at the time it is known to be a member of this collection. BodyOfWater-Intermittent-WetPhase Blowhole-Topographical A hole in coastal rock through which sea water is forced by a rising tide or waves and spurted through an outlet into the air. blowhole-topographical A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rGsf-JG0yQdeSn9ff-q8Raw" class="cyc_term">SnowCoveredArea</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvHq_1LtlEdqAAAACs6hnmQ" class="cyc_term">Snowfield</a> is an area of permanent snow and ice, and forms an accumulation area for a glacier. Snowfield snowfield open area OpenArea An outdoor space, exposed to the sky, where things can move unimpeded in any direction. A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEVpZwpEbGdrcN5Y29ycA" class="cyc_term">Shoreline</a> is a region along an edge of a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a>. <p/> Specializations of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEVpZwpEbGdrcN5Y29ycA" class="cyc_term">Shoreline</a> include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjvKZwpEbGdrcN5Y29ycA" class="cyc_term">Beach</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQCQD5wpEbGdrcN5Y29ycA" class="cyc_term">Seacoast</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQtjpJwpEbGdrcN5Y29ycA" class="cyc_term">Riverbank</a>. Shoreline shoreline InterduneTrough A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvdzSmpwpEbGdrcN5Y29ycA" class="cyc_term">CavityWithWalls</a>. Instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r0GdlfIF0EdqAAAACs6hnlQ" class="cyc_term">InterduneTrough</a> is a trough formed between parallel longitudinal <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPK2aJwpEbGdrcN5Y29ycA" class="cyc_term">Dune</a>s. interdune trough sea Sea A specialization of both <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvftLRZwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater_Large</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkFGZwpEbGdrcN5Y29ycA" class="cyc_term">SeaWater</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjMf5wpEbGdrcN5Y29ycA" class="cyc_term">Sea</a> is a body of salt water as large as (or larger than) a lake. Instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjMf5wpEbGdrcN5Y29ycA" class="cyc_term">Sea</a> include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjgu5wpEbGdrcN5Y29ycA" class="cyc_term">PacificOcean</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViDaJwpEbGdrcN5Y29ycA" class="cyc_term">IonianSea</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj6aJwpEbGdrcN5Y29ycA" class="cyc_term">EastChinaSea</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVirjJwpEbGdrcN5Y29ycA" class="cyc_term">BlackSea</a>. prairie A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEAo5wpEbGdrcN5Y29ycA" class="cyc_term">Grassland</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv2_3s5wpEbGdrcN5Y29ycA" class="cyc_term">Prairie</a> is an area where long grasses are dominant. Praires are found in central North America, eastern South Africa and the Pampas of Argentina. Prairie DuneRange A collection of topographical features on planetary bodies. Each element of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvj2qZpwpEbGdrcN5Y29ycA" class="cyc_term">DuneRange</a> is a natural group of dunes. range of dunes The collection of all rough terrain. A type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvn7CU5wpEbGdrcN5Y29ycA" class="cyc_term">NaturalThing</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViACZwpEbGdrcN5Y29ycA" class="cyc_term">GeographicalRegion</a>. The collection <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjGtZwpEbGdrcN5Y29ycA" class="cyc_term">RuggedTerrain</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rlM55WnSuEdaAAACgyZzFrg" class="cyc_term">RegionTypeByTerrain</a>, an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVny6pwpEbGdrcN5Y29ycA" class="cyc_term">ExistingStuffType</a>, a <font color="#ff0000">#$TerrainCollection</font>, and a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a>. rough terrain RuggedTerrain BrightSpot-Topographical The collection of all topographical features noted for significantly higher albedo than surrounding terrain. bright spot Flexus-Planetary A collection of topographical features. Each element of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvrRkfJwpEbGdrcN5Y29ycA" class="cyc_term">Flexus_Planetary</a> is an very low curvilinear ridge with a scalloped pattern on an extraterrestrial planetary body. flexus large body of water BodyOfWater-Large Bodies of water which are substantial in some sense. For example, a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPKnNpwpEbGdrcN5Y29ycA" class="cyc_term">Puddle</a> or a small <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViptpwpEbGdrcN5Y29ycA" class="cyc_term">Creek</a> are not substantial bodies of water, but <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjktpwpEbGdrcN5Y29ycA" class="cyc_term">Ocean</a>s and many <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi4IpwpEbGdrcN5Y29ycA" class="cyc_term">Lake</a>s are. A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvftLRZwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater_Large</a> tends to be permanent, not seasonal (though there are exceptions). Large bodies of water count as water area in geographical calculations, while non-large bodies of water do not. A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjORZwpEbGdrcN5Y29ycA" class="cyc_term">TopographicalFeature</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvakVVZwpEbGdrcN5Y29ycA" class="cyc_term">InanimateObject_Natural</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD8xJwpEbGdrcN5Y29ycA" class="cyc_term">Glacier</a> is a very slowly moving (practically stationary) thick sheet of ice which expands down a slope or out from the center (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD8lJwpEbGdrcN5Y29ycA" class="cyc_term">Icecap</a>). Glacier glacier loch Loch-Lake A sub-collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi4IpwpEbGdrcN5Y29ycA" class="cyc_term">Lake</a>. Each instance is a Scottish lake. Ejecta A possibly discontinuous mass of planetary stuff ejected violently from another topographical feature. Typically, ejecta are those pieces of planetary stuff ejected by an impact event or the explosion of a volcano. ejecta sill Sill-TerrainFeature A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ry9iuUrqgEdqAAAACs6hnmQ" class="cyc_term">Sill_TerrainFeature</a> is the low part of a saddle (see the collection <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rRT_9eAAcQdiXnYzX-YgaaQ" class="cyc_term">Saddle_TerrainFeature</a>) separating basins (see the collection <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjzyJwpEbGdrcN5Y29ycA" class="cyc_term">Basin_Topographical</a>). Trough-Topographical Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rSKVrDK6rEdqAAAAOpjlAWA" class="cyc_term">Trough_Topographical</a> is a long, narrow depression in a planetary surface, not any deeper than wide, especially with relatively steep sides and flat bottom, but less steep and deep than a trench. trough (IntermittentBodyOfWaterFn SaltLake) intermittent salt lake (CollectionIntersectionFn (TheSet GravellySoilRegion Desert)) member of The Set gravelly desert A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi1YJwpEbGdrcN5Y29ycA" class="cyc_term">Bay</a> is an inlet of a sea or lake, and is usually smaller than a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkABpwpEbGdrcN5Y29ycA" class="cyc_term">Gulf</a>. Bay bay RiftValley A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKGZwpEbGdrcN5Y29ycA" class="cyc_term">Valley</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViduZwpEbGdrcN5Y29ycA" class="cyc_term">Fault_Topographical</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rqiAbPIw6QdmbCLgwIbRh5A" class="cyc_term">RiftValley</a> is an elongated depression, trough, or graben in the earth's crust, bounded on both sides by normal faults. Rift valleys are found both on continents and under oceans. rift valley A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEVpZwpEbGdrcN5Y29ycA" class="cyc_term">Shoreline</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQCQD5wpEbGdrcN5Y29ycA" class="cyc_term">Seacoast</a> is the edge of a land mass where it adjoins a sea or ocean. A seacoast might consist of a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjvKZwpEbGdrcN5Y29ycA" class="cyc_term">Beach</a>, tidal flats, rocks, or glaciers. Seacoast coastline A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a> which subsumes areas illuminated by starlight. area illuminated by starlight AreaIlluminatedByStarlight rim The uppermost edge of a deep topographical depression, such as the rim of a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPKjXpwpEbGdrcN5Y29ycA" class="cyc_term">Crater</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD_SpwpEbGdrcN5Y29ycA" class="cyc_term">Canyon</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKUJwpEbGdrcN5Y29ycA" class="cyc_term">Volcano</a>, etc. Rim-Topographical The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s characterized by a tundra ecology. Instances feature rainfall that averages less than 25 cm. a year, and the soil is permafrost. Bryophytes and lichens predominate. TundraEcosystem tundra ecosystem The collection of all lunar topographical features. A type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rviFZcZwpEbGdrcN5Y29ycA" class="cyc_term">LunarStuff</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvn7CU5wpEbGdrcN5Y29ycA" class="cyc_term">NaturalThing</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvvLZkpwpEbGdrcN5Y29ycA" class="cyc_term">LunarTopographicalFeature</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a>. lunar topographical feature LunarTopographicalFeature A topographical peak within the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvXX07pwpEbGdrcN5Y29ycA" class="cyc_term">CraterBasin</a> of an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwMYaj5wpEbGdrcN5Y29ycA" class="cyc_term">ImpactCrater</a>. crater's central peak uplift CentralPeakUpliftOfCrater Rookery A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQrzS5wpEbGdrcN5Y29ycA" class="cyc_term">NaturalRegion</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj5GpwpEbGdrcN5Y29ycA" class="cyc_term">Habitat</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rr8A7NgnoEdqAAAACs0x8nw" class="cyc_term">Rookery</a> is a place used for breeding by birds or seals. rookery bank Bank-Topographical A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rqKcF-iTVQdefD8zuIYgMZQ" class="cyc_term">Bank_Topographical</a> is an elevation, either at the edge of a stream (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r8fYsMJgLQdmLEpsEEhz2cQ" class="cyc_term">Streambank</a>) or underwater (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwwlvBpgJQdmXdZlNhDyY7w" class="cyc_term">Shoal</a>). (CollectionIntersectionFn (TheSet JunctionOfPaths DryCreekBed)) member of { junctions, arroyos } snow-covered area SnowCoveredArea A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rw-GR6G01QdeOmLs8ynjLKQ" class="cyc_term">SoftTerrain</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rGsf-JG0yQdeSn9ff-q8Raw" class="cyc_term">SnowCoveredArea</a> is a region with a standing layer of snow over it An instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjghZwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocationTypeByWeather</a> and a specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjK-ZwpEbGdrcN5Y29ycA" class="cyc_term">SunnyArea</a> is an instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a> where the weather is sunny. SunnyArea sunny location tidal creek TidalCreek A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHdJwpEbGdrcN5Y29ycA" class="cyc_term">Stream</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r0Ie75iTfQdeUedu47vi82g" class="cyc_term">TidalCreek</a> is a meandering channel in a coastal wetland subject to bi-directional tidal currents. Cf. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViptpwpEbGdrcN5Y29ycA" class="cyc_term">Creek</a>. A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKGZwpEbGdrcN5Y29ycA" class="cyc_term">Valley</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rx-lxgLtWEdqAAAACs6hnmQ" class="cyc_term">HangingValley</a> is a valley whose lower end or floor is notably higher than the valley or shore to which it leads. HangingValley hanging valley The collection of all commercially developed <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwVAaWpwpEbGdrcN5Y29ycA" class="cyc_term">Forest</a>s which are grown and maintained for the purpose of harvesting timber. TreeFarm-Plantation tree farm plantation Sound-BodyOfWater a long, broad inlet of the ocean, generally parallel to the coast; a long passage connecting 2 large bodies of water or passing between an island and the mainland sound old growth forest OldGrowthForest-Existential The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwVAaWpwpEbGdrcN5Y29ycA" class="cyc_term">Forest</a>s where some growth exists that is more than a hundred years old. Instances contain forest growth which has been developing over a period of centuries, and for this reason are considered to be non-renewable biospheric resources within the context of a given year, or even of a given century, because no biological mechanism exists which can replace them within this time frame. However, this doesn't preclude the possibility that logging has occurred within the forest - a case in point being the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEX1ZwpEbGdrcN5Y29ycA" class="cyc_term">Amazon_Region</a>. TrueContinent A specialization of both <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjp1ZwpEbGdrcN5Y29ycA" class="cyc_term">LandBody</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkLu5wpEbGdrcN5Y29ycA" class="cyc_term">Continent</a> (q.v.). The current instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwT-n15wpEbGdrcN5Y29ycA" class="cyc_term">TrueContinent</a> (on the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkL_pwpEbGdrcN5Y29ycA" class="cyc_term">PlanetEarth</a>) are the four main land masses on the surface of the earth that are surrounded by water: <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvvODEpwpEbGdrcN5Y29ycA" class="cyc_term">EasternContinent</a> (which includes Africa, Asia, and Europe), <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwHKBVJwpEbGdrcN5Y29ycA" class="cyc_term">WesternContinent</a> (which includes North and South America), <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViPRpwpEbGdrcN5Y29ycA" class="cyc_term">ContinentOfAntarctica</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv9tl95wpEbGdrcN5Y29ycA" class="cyc_term">ContinentOfAustralia</a>. true continent bend A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ruPw7jCTVQdeI1qUMHt4iEw" class="cyc_term">Bend_Topographical</a> is a curved section in the course of a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHdJwpEbGdrcN5Y29ycA" class="cyc_term">Stream</a>. Bend-Topographical NaturalObstacle natural obstacle Canyon A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKGZwpEbGdrcN5Y29ycA" class="cyc_term">Valley</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD_SpwpEbGdrcN5Y29ycA" class="cyc_term">Canyon</a> is a deep, narrow valley with very steep sides and a river flowing through the bottom. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD_SpwpEbGdrcN5Y29ycA" class="cyc_term">Canyon</a>s are produced by water erosion. canyon A collection of topographical features and a specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPzfTJwpEbGdrcN5Y29ycA" class="cyc_term">Crevice</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rMdwrBAMxQdiaCcmY2DgFlw" class="cyc_term">Depression_Topographical</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv00j95wpEbGdrcN5Y29ycA" class="cyc_term">Crevice_Topographical</a> is a long, slender cavity or crack. The width of a crevice is significantly less than its length. The depth of a crevice is often greater than its width, and is never significantly less than its width. Crevice-Topographical crevice in the earth MeanderNeck-Topographical meander neck <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r57AI6LgpEdmAAAACs0x8nw" class="cyc_term">MeanderNeck_Topographical</a> is a narrow strip of land between the two limbs of a meander loop (i.e., a bend in a stream) at its narrowest point. Habitat The living environment of an organism. On a descending scale, one can speak of biomes, vicinities, ambient environment, and contiguous environment. habitat A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvftLRZwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater_Large</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkABpwpEbGdrcN5Y29ycA" class="cyc_term">Gulf</a> is a part of a sea extending into a land mass. Instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkABpwpEbGdrcN5Y29ycA" class="cyc_term">Gulf</a> include the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjJ8JwpEbGdrcN5Y29ycA" class="cyc_term">SaronicGulf</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkIhZwpEbGdrcN5Y29ycA" class="cyc_term">GulfOfMexico</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViVn5wpEbGdrcN5Y29ycA" class="cyc_term">GulfOfArkangelsk</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkC2pwpEbGdrcN5Y29ycA" class="cyc_term">GulfOfCalifornia</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjsY5wpEbGdrcN5Y29ycA" class="cyc_term">PersianGulf</a>. Gulf gulf Promontory-OverLand promontory over land A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwMsGZpwpEbGdrcN5Y29ycA" class="cyc_term">Promontory</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rK-Hh7KogEdqAAAAOpmP6tw" class="cyc_term">Promontory_OverLand</a> is a prominent hill or bluff that overlooks and possibly jutts out into a lowland. Archipelago archipelago A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi7f5wpEbGdrcN5Y29ycA" class="cyc_term">IslandRegion</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj7_ZwpEbGdrcN5Y29ycA" class="cyc_term">Archipelago</a> is a group of many islands that form a geographical cluster. Examples include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi7u5wpEbGdrcN5Y29ycA" class="cyc_term">Ionia</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi7KJwpEbGdrcN5Y29ycA" class="cyc_term">InnerHebrides_Archipelago</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjBTZwpEbGdrcN5Y29ycA" class="cyc_term">SocietyIslands_FrenchPolynesia</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjCFJwpEbGdrcN5Y29ycA" class="cyc_term">ChannelIslands</a>. furrow A specialization of both <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rMdwrBAMxQdiaCcmY2DgFlw" class="cyc_term">Depression_Topographical</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rh5fAaHS7EdaAAACgyZzFrg" class="cyc_term">LongThinObject</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvv74OZwpEbGdrcN5Y29ycA" class="cyc_term">Furrow_Topographical</a> is a long, narrow trench or depression that can be relatively small in scale, as the furrows dug for planting seeds. Furrows are much longer than wide, but usually not a whole lot deeper than they are wide. If much deeper than wide, a long thin depression would be classified as a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv00j95wpEbGdrcN5Y29ycA" class="cyc_term">Crevice_Topographical</a>. Furrow-Topographical Meadow meadow A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEAo5wpEbGdrcN5Y29ycA" class="cyc_term">Grassland</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQrzS5wpEbGdrcN5Y29ycA" class="cyc_term">NaturalRegion</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPzvnpwpEbGdrcN5Y29ycA" class="cyc_term">Meadow</a> is a wild grassy area. (CollectionIntersectionFn (TheSet Underground Canyon)) member of { undergrounds, canyons } Chasm-Topographical chasma A deep cleft in the surface of a planet. Cape-Topographical <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rJPEbergqEdmAAAACs0x8nw" class="cyc_term">Cape_Topographical</a> is a tapering piece of land projecting into a body of water and is more prominent than a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rIHDeCrgqEdmAAAACs0x8nw" class="cyc_term">Point_Topographical</a>. cape (IntermittentBodyOfWaterFn Stream) intermittent watercourse RightRiverbank The collection of right bank of a river. See <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv3ZhY5wpEbGdrcN5Y29ycA" class="cyc_term">RightRiverbankFn</a>. right riverbank Mesa mesa A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEUypwpEbGdrcN5Y29ycA" class="cyc_term">Hill</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD8VZwpEbGdrcN5Y29ycA" class="cyc_term">Mesa</a> is a hill with steep sides and a broad, flat top (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvmUHgJwpEbGdrcN5Y29ycA" class="cyc_term">Plateau</a>). Mesas are typically found in arid climates. See also <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r7lLJhiTVQdeaVoLynwa-Sw" class="cyc_term">Butte</a>. area illuminated by moonlight AreaIlluminatedByMoonlight A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a> which subsumes areas illuminated directly or indirectly by <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjfe5wpEbGdrcN5Y29ycA" class="cyc_term">Moonlight</a>. Rockfall A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjQsJwpEbGdrcN5Y29ycA" class="cyc_term">Ground</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvakVVZwpEbGdrcN5Y29ycA" class="cyc_term">InanimateObject_Natural</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rq6Q3KAnoEdqAAAACs0x8nw" class="cyc_term">Rockfall</a> is a pile of rocks or stony debris that has accumulated along a steep incline. rockfall mountain range A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjlL5wpEbGdrcN5Y29ycA" class="cyc_term">MountainRange</a> is a natural group of mountains. Instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjlL5wpEbGdrcN5Y29ycA" class="cyc_term">MountainRange</a> include the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjnepwpEbGdrcN5Y29ycA" class="cyc_term">RockyMountains</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkGYJwpEbGdrcN5Y29ycA" class="cyc_term">Andes_Mountains</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkGoJwpEbGdrcN5Y29ycA" class="cyc_term">Alps_Mountains</a>. MountainRange ShieldVolcano shield volcano A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKUJwpEbGdrcN5Y29ycA" class="cyc_term">Volcano</a> (q.v.) Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rH6ADSDPGEduAAAACs6hRXg" class="cyc_term">ShieldVolcano</a> is a wide volcano with shallow sloping sides. Such volcanoes are characterized lava flows with low viscosity. A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rMdwrBAMxQdiaCcmY2DgFlw" class="cyc_term">Depression_Topographical</a>. A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwpjBYCTaQdeX6tnlJ2iTWg" class="cyc_term">Caldera</a> is a large depression (typically measuring several kilometers across) formed by the collapse of a volcanic mountain or by a volcanic explosion. caldera Caldera pillar Pillar-Topographical An instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a> and a specialization of both <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvXjEMiTfQdeQH6duDrqoeQ" class="cyc_term">RockFormation</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPudOZwpEbGdrcN5Y29ycA" class="cyc_term">StoneObject_Natural</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rphtSWiTfQdeUQ8PabVwnig" class="cyc_term">Pillar_Topographical</a> is a vertical, standing, often spire-shaped, natural rock formation, consisting of a single large rock. Ledge-Topographical A linear, flat, rocky shelf, especially one that projects, as from a wall of rock. Instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rBSfbFMjsQdeA3OwqKh8Y1g" class="cyc_term">Ledge_Topographical</a> can occur on dry land as well as underwater. ledge Dorsum-Planetary A collection of topographical features. Each element of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvWQGx5wpEbGdrcN5Y29ycA" class="cyc_term">Dorsum_Planetary</a> is an elongated topographical region on an extraterrestrial planetary body of significantly higher elevation than its surrounding area. dorsum A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQrzS5wpEbGdrcN5Y29ycA" class="cyc_term">NaturalRegion</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgDFxZwpEbGdrcN5Y29ycA" class="cyc_term">WildernessArea</a> is a undeveloped region that is virtually unpopulated by humans. WildernessArea wilderness area gap A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPzfTJwpEbGdrcN5Y29ycA" class="cyc_term">Crevice</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rKcNNdiTeQdeGX8Q4xfdiiQ" class="cyc_term">Gap_Topographical</a> is a low point or opening between hills or mountains, or in a ridge, mountain range, cliff, or other topographical feature. Gap-Topographical CaveWithMultiplePortalsToSurface natural tunnel A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViDMJwpEbGdrcN5Y29ycA" class="cyc_term">Cave</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwdrA_rtIEdqAAAACs6hnmQ" class="cyc_term">CaveWithMultiplePortalsToSurface</a> is a cave with at least two openings to the surface. A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rXIvUTCTbQdePircb4GDSgg" class="cyc_term">Flat_Topographical</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rHEvvvHS9EdaAAACgyZzFrg" class="cyc_term">Playa</a> is the floor of a desert basin with limited drainage. A playa might become the bed of a shallow lake during the rainy season. Playa playa ridge line A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjORZwpEbGdrcN5Y29ycA" class="cyc_term">TopographicalFeature</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj225wpEbGdrcN5Y29ycA" class="cyc_term">EdgeOnObject</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvYI-wJwpEbGdrcN5Y29ycA" class="cyc_term">RidgeLine_Topographical</a> is the top edge of a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ruLFjFCTfQdeUtdRDT1nAmQ" class="cyc_term">Ridge_Hill</a> (q.v.). A ridgeline is a vertex of two or more adjoining slopes of terrain from which (if the ridge on on dry land) water begins to flow in opposite direction. RidgeLine-Topographical landscape A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjORZwpEbGdrcN5Y29ycA" class="cyc_term">TopographicalFeature</a>. Each landscape is an area of landforms that can be viewed by a perceptual agent, or can be represented visually in a landscape image (c.f., <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQBe0ZwpEbGdrcN5Y29ycA" class="cyc_term">LandscapeImage</a>). Landscape An <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rJTm1RIIwEdqAAAACs6hO_g" class="cyc_term">OxbowLake</a> is a crescent-shaped <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi4IpwpEbGdrcN5Y29ycA" class="cyc_term">Lake</a> (often temporary) that is formed when a meander of a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHM5wpEbGdrcN5Y29ycA" class="cyc_term">River</a> is cut off from the main channel. OxbowLake oxbow lake A natural accumulation of sand, gravel, or alluvium forming an underwater embankment that may be partially exposed. A shallow ridge or mound of coarse unconsolidated material in a stream channel, at the mouth of a stream, estuary, or lagoon and in the wave-break zone along coasts. Bar-Topographical sand bar Summit A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwS7huJwpEbGdrcN5Y29ycA" class="cyc_term">Protrusion</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ryncJZCTfQdeEidQ7vusDfQ" class="cyc_term">Summit</a> is a prominent elevation above the surrounding level of the Earth's surface. A summit is usually the top of a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a>. summit An area of high ground from which water flows down to a stream or river. watershed Watershed Saddle-TerrainFeature saddle A broad, open pass crossing a ridge or between hills or mountains. Icecap icecap A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD8xJwpEbGdrcN5Y29ycA" class="cyc_term">Glacier</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD8lJwpEbGdrcN5Y29ycA" class="cyc_term">Icecap</a> is a glacier that slowly expands out from its center. Corrugation-Topographical corrugation in the earth The collection of topographical features characterized by alternating ridges and grooves. The width of each crevice in a corrugation is significantly less than its length. Reach-Topographical A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r4otFtgnnEdqAAAACs0x8nw" class="cyc_term">Reach_Topographical</a> is a long and straight section in the course of a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHdJwpEbGdrcN5Y29ycA" class="cyc_term">Stream</a>. reach-topographical group of rift valley (GroupFn RiftValley) An instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjghZwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocationTypeByWeather</a> and a specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHSJwpEbGdrcN5Y29ycA" class="cyc_term">CloudyArea</a> is an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a> that has at least some cloud cover, and this cloud cover is not located exclusively at ground-level (in which case the location would be an instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjl-JwpEbGdrcN5Y29ycA" class="cyc_term">FoggyArea</a> instead). CloudyArea cloudy area Interfluve A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rNJ6veMkuEdmAAAACs6hRjg" class="cyc_term">NaturalElevation</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r0eG-kq-oEdqVZQDggVbyFw" class="cyc_term">Interfluve</a> is the region of higher elevation between two adjacent valleys or streams that drain in the same direction. interfluve Nunatak <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r7rdtNLgpEdmAAAACs0x8nw" class="cyc_term">Nunatak</a> is a rock, hill, or mountain completely surrounded by glacial ice, but protruding above the ice. nunatak sounding A place, ostensibly on the surface of a body of water, at which the distance above the reference surface for a tidal datum is known. Sounding LeftRiverbank The collection of left bank of a river. See <font color="#ff0000">#$LeftBankFn</font>. left riverbank member of { hills, cones } (CollectionIntersectionFn (TheSet Hill Cone)) This is the collection of elements of terrain known as karst. These are terrain elements which have been formed chiefly by the dissolving of rock, primarily carbonates such as limestone and evaporites such as salt. Landforms which count as karst include sinkholes, caves, and natural bridges. Karst karst DryCreekBed A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvzAmOpwpEbGdrcN5Y29ycA" class="cyc_term">FlowTerrain</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQBs_5wpEbGdrcN5Y29ycA" class="cyc_term">DryCreekBed</a> is a usually-dry watercourse, also known as an <i>arroyo</i>. They are typically found in arid parts of the world. When it rains, they channel water; otherwise (i.e. most of the time) they are just dry depressions. arroyo Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rIUUBBBWAEdqAAAACs6hfSg" class="cyc_term">SaltLake</a> is a body of standing water that is inland (so is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi4IpwpEbGdrcN5Y29ycA" class="cyc_term">Lake</a>), and is filled with (though possibly intermittently) with salt water. salt lake SaltLake deciduous forest ecosystem DeciduousForestEcosystem The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s characterized by deciduous forest ecology. Instances feature rainfall that normally averages between 75 and 250 cm. a year, and the soil is rich and exhibits a high organic content. alluvial fan AlluvialFan A fan-shaped wedge of coarse alluvium with apex merging with a mountain stream bed and the fan spreading out at a low angle slope onto an adjacent plain. area illuminated by sunlight AreaIlluminatedBySunlight A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a> which subsumes areas illuminated directly or indirectly by <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViVapwpEbGdrcN5Y29ycA" class="cyc_term">Sunlight</a>. gusty location GustyArea An instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjghZwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocationTypeByWeather</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViqKZwpEbGdrcN5Y29ycA" class="cyc_term">GustyArea</a> is an instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a> in which the wind is subject to sudden changes in direction and intensity. lunar plain LunarPlain The collection of small <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj1i5wpEbGdrcN5Y29ycA" class="cyc_term">Plain_Topographical</a>s which appear on the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjWEZwpEbGdrcN5Y29ycA" class="cyc_term">MoonOfEarth</a>. A small depression in sandy terrain, caused by wind erosion. Blowout-Topographical blowout-topographical A specializaion of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rw4--UiTfQdeTAd3NPZMGfg" class="cyc_term">Slope_Topographical</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rkaRPPiTVQdeI4ZXG60qcgA" class="cyc_term">Apron_Topographical</a> is a gentle slope, with a generally smooth surface, found around groups of islands and seamounts. apron-topographical Apron-Topographical Each <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rrRq1rLgpEdmAAAACs0x8nw" class="cyc_term">Fork_Topographical</a> is a land feature consisting of a juncture of three or more channels that meet. The fork could be a branch in a canyon or valley. Fork-Topographical fork-topographical FlowTerrain A collection of topographical features. Each element of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvzAmOpwpEbGdrcN5Y29ycA" class="cyc_term">FlowTerrain</a> is a topographical region marked by the product of flowing matter, such as a volcanic flow. flow terrain A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEUypwpEbGdrcN5Y29ycA" class="cyc_term">Hill</a>. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rWOr70IFvEdqAAAACs6hnlQ" class="cyc_term">Mound_NGA</a> is a specialized concept representing a low, isolated, rounded <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEUypwpEbGdrcN5Y29ycA" class="cyc_term">Hill</a>. mound NGA Mound-NGA A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHdJwpEbGdrcN5Y29ycA" class="cyc_term">Stream</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHM5wpEbGdrcN5Y29ycA" class="cyc_term">River</a> is a natural stream of water, normally of a large volume. Instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHM5wpEbGdrcN5Y29ycA" class="cyc_term">River</a> include the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjANZwpEbGdrcN5Y29ycA" class="cyc_term">ColoradoRiverOfArizona</a>, the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjR_5wpEbGdrcN5Y29ycA" class="cyc_term">AmazonRiver</a>, the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj5qJwpEbGdrcN5Y29ycA" class="cyc_term">YangtzeRiver</a>, and the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViHb5wpEbGdrcN5Y29ycA" class="cyc_term">ThamesRiver</a>. <p/> For smaller streams, see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViptpwpEbGdrcN5Y29ycA" class="cyc_term">Creek</a>. river River Loch-Cove A sub-collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rG28AGiTbQdeR8YLno_5fww" class="cyc_term">Cove</a>. Each instance is a long narrow inlet of the sea in Scotland (especially when it is nearly landlocked). loch-cove A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a>. Instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r8Um55IFzEdqAAAACs6hnlQ" class="cyc_term">Inlet</a> are narrow waterways extending into the land, or connecting a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi1YJwpEbGdrcN5Y29ycA" class="cyc_term">Bay</a> or <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjz9pwpEbGdrcN5Y29ycA" class="cyc_term">Lagoon</a> with a larger body of water. Inlet inlet A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi4IpwpEbGdrcN5Y29ycA" class="cyc_term">Lake</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjsPJwpEbGdrcN5Y29ycA" class="cyc_term">InlandSea</a> is a large body of salt water (of second rank in relation to an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjktpwpEbGdrcN5Y29ycA" class="cyc_term">Ocean</a>) that is entirely, or almost entirely, land-locked. InlandSea inland sea Stream watercourse A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvakVVZwpEbGdrcN5Y29ycA" class="cyc_term">InanimateObject_Natural</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViVVZwpEbGdrcN5Y29ycA" class="cyc_term">FlowPath</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHdJwpEbGdrcN5Y29ycA" class="cyc_term">Stream</a> is a natural body of water that flows when it is not frozen. A stream can either be a great river (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHM5wpEbGdrcN5Y29ycA" class="cyc_term">River</a>) or a tiny creek (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViptpwpEbGdrcN5Y29ycA" class="cyc_term">Creek</a>). Most often, streams are filled with fresh water, but can in certain cases be filled with saline or brackish water (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r0Ie75iTfQdeUedu47vi82g" class="cyc_term">TidalCreek</a>). Every non-frozen stream flows in (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi8V5wpEbGdrcN5Y29ycA" class="cyc_term">in_ContOpen</a>) some conduit (see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjZOpwpEbGdrcN5Y29ycA" class="cyc_term">FluidConduit</a>) such as a streambed or riverbed. Notable instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHdJwpEbGdrcN5Y29ycA" class="cyc_term">Stream</a> include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjR_5wpEbGdrcN5Y29ycA" class="cyc_term">AmazonRiver</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi_yZwpEbGdrcN5Y29ycA" class="cyc_term">LittleMissouriRiver</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi9JZwpEbGdrcN5Y29ycA" class="cyc_term">WoundedKnee_Creek</a>. <p/> Note that riverbanks are not streams nor are they parts of streams, but rather they mark the edges of streams. TerrainFlatGround An instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rsToAdu0OQdeJiPmVIZ9JIw" class="cyc_term">TerrainTypeBySurfaceLevel</a>. Flat ground terrain is the terrain that is neither <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwHQ9cu0OQdeFY6cQCWHUBA" class="cyc_term">TerrainHighGround</a> nor <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rxX6p7O0OQdeXqZjCrR0jsg" class="cyc_term">TerrainLowGround</a>. When traversing <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ryAOMbu0OQdeZa_V-0l9r-w" class="cyc_term">TerrainFlatGround</a>, one will not encounter any significant positive or negative slope. flat ground The collection of all topographical features noted for significantly lower albedo than surrounding terrain. DarkSpot-Topographical dark spot ravine A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv00j95wpEbGdrcN5Y29ycA" class="cyc_term">Crevice_Topographical</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r678vSoFzEdqAAAACs6hnlQ" class="cyc_term">Ravine</a> is a deep, narrow, steep-walled passage. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r678vSoFzEdqAAAACs6hnlQ" class="cyc_term">Ravine</a>s are typically smaller than <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjVKJwpEbGdrcN5Y29ycA" class="cyc_term">Gorge</a>s. Ravine Terra-Planetary terra The collection of all topographical features on extra-terrestrial planetary bodies of extremely large size distingished by abrupt and clearly delineated boundaries, that is generally of higher altitude than the surrounding topographical features. Continents, large islands, bulges rising above the 'datum' of planetary bodies are all elements of this collection. Examples include Ishtar Terra on Planet Venus and Tempa Terra on Planet Mars, etc. range of hills HillRange a range of hills, analagous to <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjlL5wpEbGdrcN5Y29ycA" class="cyc_term">MountainRange</a>. Biome The collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s that exist on dry land (islands or continental land masses). biome cinder cone A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKUJwpEbGdrcN5Y29ycA" class="cyc_term">Volcano</a> (q.v.) Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ryvwmwjPGEduAAAACs6hRXg" class="cyc_term">CinderCone</a> is volcano that extrudes mainly scoria and pyroclastics that build up around the vent. CinderCone A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvdzSmpwpEbGdrcN5Y29ycA" class="cyc_term">CavityWithWalls</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvakVVZwpEbGdrcN5Y29ycA" class="cyc_term">InanimateObject_Natural</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKGZwpEbGdrcN5Y29ycA" class="cyc_term">Valley</a> is of significantly lower altitude than the area surrounding it. A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKGZwpEbGdrcN5Y29ycA" class="cyc_term">Valley</a> is distinguished from a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViQUZwpEbGdrcN5Y29ycA" class="cyc_term">Basin</a> by having sharper sides, and typically has <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a>s (or smaller elevations) surrounding it. valley Valley BoulderField field of boulders A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjQsJwpEbGdrcN5Y29ycA" class="cyc_term">Ground</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQrcipwpEbGdrcN5Y29ycA" class="cyc_term">OpenArea</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r1IgdvCTVQdeXMLGWDwlcAA" class="cyc_term">BoulderField</a> is a flat area bare of vegetation and covered with <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwP3v15wpEbGdrcN5Y29ycA" class="cyc_term">Boulder</a>s. Boulder fields are typically found in high altitude and high latitude regions. A collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViACZwpEbGdrcN5Y29ycA" class="cyc_term">GeographicalRegion</a>s. Each <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv7L9xpwpEbGdrcN5Y29ycA" class="cyc_term">MineralField</a> is a region on the surface of the planet underground of which is rich in a specific type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQCJAJwpEbGdrcN5Y29ycA" class="cyc_term">Mineral</a>. MineralField mineral field CompletelyCloudCoveredArea A instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHBpwpEbGdrcN5Y29ycA" class="cyc_term">DegreeOfCloudiness</a> and a specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHSJwpEbGdrcN5Y29ycA" class="cyc_term">CloudyArea</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViGIpwpEbGdrcN5Y29ycA" class="cyc_term">CompletelyCloudCoveredArea</a> is an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a> that is so clouded-over with a uniform layer of grey or white clouds that direct sunlight is blocked out. There are no shadows, and the shape or exact location of the sun or moon is impossible to identify. overcast location A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjz9pwpEbGdrcN5Y29ycA" class="cyc_term">Lagoon</a> is a shallow body of water that is connected to a larger body of water, but separated from it (e.g. by sandbars or coral reefs). Lagoon lagoon crater basin A topographical depression comprising the portion of a crater inside the rim. CraterBasin hammock-topographical Hammock-Topographical A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rhJgQuK1ZEdqAAAACs6hO_g" class="cyc_term">Hammock_Topographical</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEUypwpEbGdrcN5Y29ycA" class="cyc_term">Hill</a> which is distinct from and slightly above the surrounding plain or wetland. The class of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViACZwpEbGdrcN5Y29ycA" class="cyc_term">GeographicalRegion</a>s that lie within the geographical boundaries of two or more <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s of differing types, and that are characterized by the fact that many agents from both <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s (<a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rw3z52vL2EdyAAAACs6hbjw" class="cyc_term">agentInEcosystem</a>) share the region in question as a habitat. Ecotone ecotone oasis Oasis A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjKJ5wpEbGdrcN5Y29ycA" class="cyc_term">EcologicalRegion</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPKaz5wpEbGdrcN5Y29ycA" class="cyc_term">Oasis</a> is a small fertile region surrounded by a more arid <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjreZwpEbGdrcN5Y29ycA" class="cyc_term">Desert</a> region. wetland The collection of all portions of wetland. A type of ecological region in the set of ?ECOTONE such that some ecosystem is not some other ecosystem ?ECOSYSTEM2 and ?ECOTONE is geographic border between that ecosystem and ?ECOSYSTEM2, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvn7CU5wpEbGdrcN5Y29ycA" class="cyc_term">NaturalThing</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a>. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvh8GOpwpEbGdrcN5Y29ycA" class="cyc_term">WetlandRegion</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a>. WetlandRegion ground has perma frost PermaFrostRegion A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViACZwpEbGdrcN5Y29ycA" class="cyc_term">GeographicalRegion</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvV83uJwpEbGdrcN5Y29ycA" class="cyc_term">PermaFrostRegion</a> has a layer of permanently frozen ground insulated by a shallow layer of soil that thaws during the spring and summer. SulfurSpring sulphur spring A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgESBJwpEbGdrcN5Y29ycA" class="cyc_term">Spring_WaterSource</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r7OE3ALnhEdqAAAACs6hnmQ" class="cyc_term">SulfurSpring</a> is a spring from which a small stream of sulphur ground water flows. fiord Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViGYZwpEbGdrcN5Y29ycA" class="cyc_term">Fjord</a> is an arm of the sea characterized by sheer parallel walls often extending far below the water surface and by many branches. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViGYZwpEbGdrcN5Y29ycA" class="cyc_term">Fjord</a>s are found where the land next to the sea is mountainous, usually at high latitudes. Fjord Promontorium-Lunar A collection of topographical features. Each element of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwDheIpwpEbGdrcN5Y29ycA" class="cyc_term">Promontorium_Lunar</a> is a prominent mass of land overlooking or projecting into a lunar lowland. This collection is restricted to promontories on Earth's Moon only. lunar promontorium plain A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rjXL9znS-EdaAAACgyZzFrg" class="cyc_term">FlatRegion</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj1i5wpEbGdrcN5Y29ycA" class="cyc_term">Plain_Topographical</a> is a large area of level, open land. Plain-Topographical strait The collection of water passageways connecting two larger bodies of water. Strait DarkLargeArea-Topographical The collection of all large area topographical features noted for significantly lower albedo than surrounding terrain. dark large area salt flat SaltFlat A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r8sQBHoLFEdqAAAACs6hO_g" class="cyc_term">SaltFlat</a> is a shallow basin or flat where salt accumulates after periodic inundation or the evaporation of a intermittent body of water. BrightAlbedoFeature-Topographical The collection of all topographical features noted for an albedo (reflectivity of light) significanly brighter than the surrounding regions. bright albedo feature <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi2r5wpEbGdrcN5Y29ycA" class="cyc_term">Forest_Temperate</a> is the collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwVAaWpwpEbGdrcN5Y29ycA" class="cyc_term">Forest</a>s which are found in temperate climates. Forest-Temperate temperate forest A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a>. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rB-1yvoLfEdqAAAACs6hnlQ" class="cyc_term">Keld</a>s are deep, relatively still areas in <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHM5wpEbGdrcN5Y29ycA" class="cyc_term">River</a>s. Keld keld embankment Embankment A collection of fixed structures. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvlCLGpwpEbGdrcN5Y29ycA" class="cyc_term">Embankment</a> is a long raised structure of earth, gravel, etc., used to hold back water or to carry a road or railroad. Seamount seamount A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rw87kPIIlEdqAAAACs6hO_g" class="cyc_term">Seamount</a> is an underwater <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a> rising from the seafloor that does not reach to the surface of the <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQBWdJwpEbGdrcN5Y29ycA" class="cyc_term">EarthsOceanSea</a>. underwater bank Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ryIAxShTIEdqAAAACs6hfSg" class="cyc_term">Bank_Underwater</a> is an elevated area, usually on a shelf. Though shallower than surrounding areas, the depth of water over a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ryIAxShTIEdqAAAACs6hfSg" class="cyc_term">Bank_Underwater</a> is usually sufficient for most surface vessels to pass. For shallower areas, see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwwlvBpgJQdmXdZlNhDyY7w" class="cyc_term">Shoal</a>. Bank-Underwater heavy forest HeavyForest The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwVAaWpwpEbGdrcN5Y29ycA" class="cyc_term">Forest</a>s whose tree growth may be said to be heavy or dense as compared to other forests. Arch-Topographical arch A natural arch-like opening in a rock mass. Also called a natural bridge. intermittent body of water in a dry phase A specialization of both <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rUJF2khTtEdqAAAACs6hfSg" class="cyc_term">BodyOfWater_Intermittent</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rsZWSuP_rEdqAAAACs0uFOQ" class="cyc_term">BodyOfWater_Dry</a> (qq.v.). Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rUpHR5BTtEdqAAAACs6hfSg" class="cyc_term">BodyOfWater_Intermittent_DryPhase</a> is a region that is often inundated with a relatively large volume of stationary or flowing water, but which has virtually no water present at the current time. BodyOfWater-Intermittent-DryPhase (CollectionIntersectionFn (TheSet UnderwaterLocation Corrugation-Topographical (SubcollectionByRegionFn TopographicalFeature (CoastlineFn BajaCalifornia-Peninsula)))) member of The Set underwater corrugation in the earth Subcollection By Region Fn topographical feature the coastline of Baja California cuesta A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rd_696q1SEdqAAAACs6hO_g" class="cyc_term">Cuesta</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ruLFjFCTfQdeUtdRDT1nAmQ" class="cyc_term">Ridge_Hill</a> formed by gently tilted hard rock layers. Every cuesta has an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rVuYm3CTbQdeFI5T0eezPYw" class="cyc_term">Escarpment</a> where the rock layers are exposed on their edges. Cuesta A coral island consisting of a reef surrounding a lagoon. atoll Atoll alluvial deposit at mouth of river, usually threaded by multiple channels Delta delta This is the collection of ecosystems. An ecosystem is a particular region in which organisms live, together with the interrelations between these organisms and the relations between these organisms and their physical environment. ecosystem Ecosystem isthmus Isthmus A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjQ2pwpEbGdrcN5Y29ycA" class="cyc_term">Isthmus</a> is a narrow strip of land that has bodies of water on either side, and which connects two larger bodies of land. gully Gully The collection of all gullies, which are landforms created by running water eroding sharply into soil. A type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvzAmOpwpEbGdrcN5Y29ycA" class="cyc_term">FlowTerrain</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvRx7euSQQdeDw8ccx74rdg" class="cyc_term">NaturalObstacle</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKGZwpEbGdrcN5Y29ycA" class="cyc_term">Valley</a>. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r7XhcuOVwQdeQl6fjxYEpmQ" class="cyc_term">Gully</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a>. LightForest The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwVAaWpwpEbGdrcN5Y29ycA" class="cyc_term">Forest</a>s whose tree growth may be said to be light. This means there is a greater amount of space in between the trees as compared to other forests, see also <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r7fE_oJKoEdaYrQACs1uxFw" class="cyc_term">HeavyForest</a>. light forest AnimalSanctuary animal sanctuary A natural area set aside and for the preservation and protection of wildlife. A deep narrow slot, notch, or groove in a coastal cliff. cleft Cleft estuary Estuary A subcollection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjI85wpEbGdrcN5Y29ycA" class="cyc_term">Estuary</a> an arm of the sea at the lower end of a river, where tide meets outflow, usually associated with a widening of the river channel. <p/> Compare with <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjvCZwpEbGdrcN5Y29ycA" class="cyc_term">Delta</a>. Also see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjIspwpEbGdrcN5Y29ycA" class="cyc_term">riverEndTopography</a>. geological basin Basin-Topographical A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rMdwrBAMxQdiaCcmY2DgFlw" class="cyc_term">Depression_Topographical</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViQUZwpEbGdrcN5Y29ycA" class="cyc_term">Basin</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjzyJwpEbGdrcN5Y29ycA" class="cyc_term">Basin_Topographical</a> is a bowl-shaped depression in the surface of the land or the ocean floor. crevasse Crevasse A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv00j95wpEbGdrcN5Y29ycA" class="cyc_term">Crevice_Topographical</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwP1O35wpEbGdrcN5Y29ycA" class="cyc_term">Crevasse</a> is a large crack in a stone object or a glacier. Crevasses are at least as long as a person, and are a hazard for mountain climbers. Cordillera cordillera An entire mountain system including all subordinate ranges, interior plateaus, and basins. Every instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjlL5wpEbGdrcN5Y29ycA" class="cyc_term">MountainRange</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjNiZwpEbGdrcN5Y29ycA" class="cyc_term">geographicalSubRegions</a> of some instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rFVJO5CTbQdeZNOQNYAY9OA" class="cyc_term">Cordillera</a>, while every instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rFVJO5CTbQdeZNOQNYAY9OA" class="cyc_term">Cordillera</a> has at least one <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjlL5wpEbGdrcN5Y29ycA" class="cyc_term">MountainRange</a> as a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjNiZwpEbGdrcN5Y29ycA" class="cyc_term">geographicalSubRegions</a> of it. However, no instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rFVJO5CTbQdeZNOQNYAY9OA" class="cyc_term">Cordillera</a> can be a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjNiZwpEbGdrcN5Y29ycA" class="cyc_term">geographicalSubRegions</a> of a larger <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjlL5wpEbGdrcN5Y29ycA" class="cyc_term">MountainRange</a>. In particular, no two distinct instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rFVJO5CTbQdeZNOQNYAY9OA" class="cyc_term">Cordillera</a> may bear the relation <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjNiZwpEbGdrcN5Y29ycA" class="cyc_term">geographicalSubRegions</a> with each other. promontory A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwS7huJwpEbGdrcN5Y29ycA" class="cyc_term">Protrusion</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwMsGZpwpEbGdrcN5Y29ycA" class="cyc_term">Promontory</a> is a protrusion of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwPuiRJwpEbGdrcN5Y29ycA" class="cyc_term">LandStuff</a> that is elevated above and juts out into a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a> or <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rXIvUTCTbQdePircb4GDSgg" class="cyc_term">Flat_Topographical</a>. A notable specialization is <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViPJpwpEbGdrcN5Y29ycA" class="cyc_term">Peninsula</a>. Promontory Volcano volcano A collection of topographical features. Each element of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKUJwpEbGdrcN5Y29ycA" class="cyc_term">Volcano</a> is a mountain created by the outflow of lava. Elements of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKUJwpEbGdrcN5Y29ycA" class="cyc_term">Volcano</a> may or may not be active volcanoes. Examples: <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjuO5wpEbGdrcN5Y29ycA" class="cyc_term">Vesuvius_Volcano</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjmHpwpEbGdrcN5Y29ycA" class="cyc_term">MountFuji_Volcano</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj--ZwpEbGdrcN5Y29ycA" class="cyc_term">Popocatepetl_Volcano</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViRF5wpEbGdrcN5Y29ycA" class="cyc_term">Krakatoa_Volcano</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjmopwpEbGdrcN5Y29ycA" class="cyc_term">MaunaKea_Volcano</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi6WpwpEbGdrcN5Y29ycA" class="cyc_term">MountSaintHelens_Volcano</a>. dried up lake A dried up or drained area of a former lake. LakeBed Guyot A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rxKENzIIlEdqAAAACs6hO_g" class="cyc_term">Guyot</a> is a flat-topped <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rw87kPIIlEdqAAAACs6hO_g" class="cyc_term">Seamount</a>. guyot TopographicalFeature A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViACZwpEbGdrcN5Y29ycA" class="cyc_term">GeographicalRegion</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjORZwpEbGdrcN5Y29ycA" class="cyc_term">TopographicalFeature</a> is a three-dimensional feature of a planet's surface, typically with boundaries defined by formations of rock, dirt, water, etc., or by significant changes in elevation. <p/> Some important specializations of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjORZwpEbGdrcN5Y29ycA" class="cyc_term">TopographicalFeature</a> include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjlL5wpEbGdrcN5Y29ycA" class="cyc_term">MountainRange</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViPJpwpEbGdrcN5Y29ycA" class="cyc_term">Peninsula</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjNz5wpEbGdrcN5Y29ycA" class="cyc_term">Harbor</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEVpZwpEbGdrcN5Y29ycA" class="cyc_term">Shoreline</a>. Instances include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi-apwpEbGdrcN5Y29ycA" class="cyc_term">KyushuIsland_Japan</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViWr5wpEbGdrcN5Y29ycA" class="cyc_term">SaintThomas_Island</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi5xZwpEbGdrcN5Y29ycA" class="cyc_term">LakeErie</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjSDZwpEbGdrcN5Y29ycA" class="cyc_term">VictoriaFalls</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViQLZwpEbGdrcN5Y29ycA" class="cyc_term">MalayPeninsula</a>. <p/> Note that collections of regions defined by the presence of human artifacts (e.g. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQtfnJwpEbGdrcN5Y29ycA" class="cyc_term">CitySkyline</a>) or ecological characteristics (e.g. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwVAaWpwpEbGdrcN5Y29ycA" class="cyc_term">Forest</a>) are <i>not</i> specializations of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjORZwpEbGdrcN5Y29ycA" class="cyc_term">TopographicalFeature</a>. topographical feature A sub-collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi7OZwpEbGdrcN5Y29ycA" class="cyc_term">Island</a>. Each instance is a long narrow sandy island (wider than a reef) running parallel to the shore. BarrierIsland barrier island underwater topographical feature A collection of geographical regions and a specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjOh5wpEbGdrcN5Y29ycA" class="cyc_term">LandTopographicalFeature</a> and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj1PJwpEbGdrcN5Y29ycA" class="cyc_term">UnderwaterLocation</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rof0FHLgpEdmAAAACs0x8nw" class="cyc_term">UnderwaterTopographicalFeature</a> is a region of land under a body of water and is distinguishable from surrounding regions by salient physical differences in surface texture, three-dimensional shape, or elevation. UnderwaterTopographicalFeature pristine old growth forest OldGrowthForest-Absolute The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwVAaWpwpEbGdrcN5Y29ycA" class="cyc_term">Forest</a>s where no logging has occurred for the past several hundred years. Instances contain forest growth which has been developing over a period of centuries, and for this reason are considered to be non-renewable biospheric resources within the context of a given year, or even of a given century, because no biological mechanism exists which can replace them within this time frame. CraterBasinFormedByImpact impact crater's basin A topographical depression comprising the portion of an impact crater inside the rim. The basin contains breccia and may contain impact melt. lunar crater Crater-Lunar A circular depression in the surrounding terrain of the Earth's moon. A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r35-YRJKVQdmKwIXakc9wLA" class="cyc_term">Channel_WaterPath</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rZFDdmim7QdiJ0JtTcg0Ipw" class="cyc_term">Cutoff</a> is a relatively new channel that cuts across and joins two points of a meandering stream (e.g. across the neck of an oxbow). Cutoff cutoff second growth forest SecondGrowthForest The collection of forests wherein some logging has occurred, but where there has also been some secondary growth of trees in the affected areas. Regio-Planetary A collection of topographical features. Each element of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvfFawpwpEbGdrcN5Y29ycA" class="cyc_term">Regio_Planetary</a> is a large geographical region with a significantly different <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwUho1JwpEbGdrcN5Y29ycA" class="cyc_term">AlbedoFeature_Topographical</a> than the surrounding terrain. planetary regio lava field Land formations resulting from the consolidation of molten rock on the surface of the Earth. LavaField The collection of all topographical features noted for an albedo (reflectivity of light) significanly darker than the surrounding regions. dark albedo feature DarkAlbedoFeature-Topographical (CollectionIntersectionFn (TheSet Icecap Summit)) member of { icecaps, summits } AquaticLifeZone The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s that exist within bodies of fresh or salt water. aquatic life zone Gut-Topographical A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViE_JwpEbGdrcN5Y29ycA" class="cyc_term">BodyOfWater</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rMpQ3YiTeQdeDuLKLIg3GJQ" class="cyc_term">Gut_Topographical</a> is a relatively small coastal waterway connecting larger bodies of water or other waterways. gut Waterhole A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjTaJwpEbGdrcN5Y29ycA" class="cyc_term">Pond</a>. Instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rKnXZLo95EdqAAAAH6Q2Zvw" class="cyc_term">Waterhole</a> are small holes, hollows or depressions containing water. Such water sources are of great importance to wildlife as well as humans and livestock in arid regions. waterhole A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjzyJwpEbGdrcN5Y29ycA" class="cyc_term">Basin_Topographical</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rzkwSgiTaQdeO4p5Nb90Sww" class="cyc_term">Cirque</a> is a bowl-like hollow partially surrounded by cliffs or steep slopes at the head of a glaciated valley. cirque Cirque Ocean ocean A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjMf5wpEbGdrcN5Y29ycA" class="cyc_term">Sea</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjktpwpEbGdrcN5Y29ycA" class="cyc_term">Ocean</a> is one of the oceans of the world. This includes <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwQBWdJwpEbGdrcN5Y29ycA" class="cyc_term">EarthsOceanSea</a>, the interconnected expanse of salt water covering 71% of the Earth's surface, and of which the other oceans are subregions. Examples: <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkB0pwpEbGdrcN5Y29ycA" class="cyc_term">AtlanticOcean</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjIeZwpEbGdrcN5Y29ycA" class="cyc_term">ArcticOcean</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViH35wpEbGdrcN5Y29ycA" class="cyc_term">IndianOcean</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjgu5wpEbGdrcN5Y29ycA" class="cyc_term">PacificOcean</a>. RainyArea An <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjghZwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocationTypeByWeather</a> and a specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkHSJwpEbGdrcN5Y29ycA" class="cyc_term">CloudyArea</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViuM5wpEbGdrcN5Y29ycA" class="cyc_term">RainyArea</a> is an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVixhpwpEbGdrcN5Y29ycA" class="cyc_term">OutdoorLocation</a> at which it is raining. If the rain is heavy, the location is probably also a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r0yRMxC0mQdmPK-79ElYBKA" class="cyc_term">StormyArea</a>. rainy area peninsula A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwMsGZpwpEbGdrcN5Y29ycA" class="cyc_term">Promontory</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViPJpwpEbGdrcN5Y29ycA" class="cyc_term">Peninsula</a> is a protuberance of a geographic land region into water region. The length of a peninsula exceeds the width of its connecting neck. Peninsula headland A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rwMsGZpwpEbGdrcN5Y29ycA" class="cyc_term">Promontory</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ryjTUsqrKEdqAAAAOpmP6tw" class="cyc_term">Headland</a> is a high bluff that jutts out into a large body of water. Headland coastal region CoastalRegion The collection of all coastal regions. A type of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvViACZwpEbGdrcN5Y29ycA" class="cyc_term">GeographicalRegion</a>. <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVj1fpwpEbGdrcN5Y29ycA" class="cyc_term">CoastalRegion</a> is a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a>. Ravine-Topographical A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv00j95wpEbGdrcN5Y29ycA" class="cyc_term">Crevice_Topographical</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rpBq0sAkVEdqAAAACs0x8nw" class="cyc_term">Ravine_Topographical</a> is a deep, narrow, steep-walled passage, but shallower than a <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjVKJwpEbGdrcN5Y29ycA" class="cyc_term">Gorge</a>. ravine-topographical MangroveIsland mangrove island A sub-collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVi7OZwpEbGdrcN5Y29ycA" class="cyc_term">Island</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ri_PMka-rEdqVZgDggVbyFw" class="cyc_term">MangroveIsland</a> is a swampy island, surrounded by a body of water, and occupied by <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjqNJwpEbGdrcN5Y29ycA" class="cyc_term">MangroveTree</a>s. PartiallyUndergroundStream lost river Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rdEqJ-K62EdqAAAAOpjlAWA" class="cyc_term">PartiallyUndergroundStream</a> is a stream or river which for one or more sections does not flow above ground, but flows below the surface, possibly reappearing further downstream, possibly not. GrasslandPrairieEcosystem grassland prairie ecosystem The collection of all <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rv_UD6pwpEbGdrcN5Y29ycA" class="cyc_term">Ecosystem</a>s characterized by grassland prairie ecology. Instances feature rainfall that normally averages between 10 and 60 cm. a year, and the soil is of good quality. Sod-forming grasses predominate. rolling grassland A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgEAo5wpEbGdrcN5Y29ycA" class="cyc_term">Grassland</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r7fE_opKoEdaYrQACs1uxFw" class="cyc_term">RollingGrassland</a> is a geographical region that is grassy and slightly hilly. RollingGrassland lacus Lacus-Lunar The collection of topographical features where each element is a a small plain on Earth's moon. (IntermittentBodyOfWaterFn OxbowLake) intermittent oxbow lake A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkKUJwpEbGdrcN5Y29ycA" class="cyc_term">Volcano</a> (q.v.) Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rdcqnjjPJEduAAAACs6hRXg" class="cyc_term">ExtinctVolcano</a> is a volcano that is no longer expected to erupt. ExtinctVolcano extinct volcano Geyser A specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rQY8ZfoPDEdaAAAACs0uFOQ" class="cyc_term">HotSpring</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgETPZwpEbGdrcN5Y29ycA" class="cyc_term">Geyser</a> is a spring that periodically emits steam and hot water. The water has been heated to boiling underground by lava, and is then forced up through the hole in the ground. geyser wilderness park Parks which are mostly wild area, intended for wildlife preservation, camping, hiking, and sightseeing WildernessPark The collection of all specializations of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rHIBS0h_TEdaAAABQ2rksLw" class="cyc_term">FirstOrderCollection</a>, that is, of all collections of (first-order) collections, and an instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rHUFI8h_TEdaAAABQ2rksLw" class="cyc_term">ThirdOrderCollection</a>. Instances of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rHQdVmB_TEdaAAABQ2rksLw" class="cyc_term">SecondOrderCollection</a> are collections of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rHIBS0h_TEdaAAABQ2rksLw" class="cyc_term">FirstOrderCollection</a>s. Any instance of any instance of any instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rHQdVmB_TEdaAAABQ2rksLw" class="cyc_term">SecondOrderCollection</a> is an <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjaApwpEbGdrcN5Y29ycA" class="cyc_term">Individual</a>. SecondOrderCollection second-order Cyc collection A <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rHQdVmB_TEdaAAABQ2rksLw" class="cyc_term">SecondOrderCollection</a>. Each instance of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r6-wc8BKxEdeIXwCgydofLQ" class="cyc_term">CartographicFeatureType</a> is a specialization of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjTtJwpEbGdrcN5Y29ycA" class="cyc_term">Place</a> whose instances are often displayed on maps or conceptualized cartographically. CartographicFeatureType cartographic feature type natural feature type NaturalFeatureType <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a> is the collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r6-wc8BKxEdeIXwCgydofLQ" class="cyc_term">CartographicFeatureType</a>s which naturally occur on the surface of the Earth. Positive examples include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjktpwpEbGdrcN5Y29ycA" class="cyc_term">Ocean</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD8VZwpEbGdrcN5Y29ycA" class="cyc_term">Mesa</a>. Negative examples include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjzt5wpEbGdrcN5Y29ycA" class="cyc_term">WaterReservoir</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjzcZwpEbGdrcN5Y29ycA" class="cyc_term">Canal</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rT2uByCTVQdeVZZaE0030Zg" class="cyc_term">Airfield</a>. Also see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ru-8ymLHtEdmAAAACs6hO_g" class="cyc_term">ArtifactualFeatureType</a>, the corresponding collection for feature types which are <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkH_ZwpEbGdrcN5Y29ycA" class="cyc_term">Artifact</a>s. natural feature type NaturalFeatureType <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rummjkLHtEdmAAAACs6hO_g" class="cyc_term">NaturalFeatureType</a> is the collection of <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4r6-wc8BKxEdeIXwCgydofLQ" class="cyc_term">CartographicFeatureType</a>s which naturally occur on the surface of the Earth. Positive examples include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjODZwpEbGdrcN5Y29ycA" class="cyc_term">Mountain</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjktpwpEbGdrcN5Y29ycA" class="cyc_term">Ocean</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvgD8VZwpEbGdrcN5Y29ycA" class="cyc_term">Mesa</a>. Negative examples include <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjzt5wpEbGdrcN5Y29ycA" class="cyc_term">WaterReservoir</a>, <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVjzcZwpEbGdrcN5Y29ycA" class="cyc_term">Canal</a>, and <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rT2uByCTVQdeVZZaE0030Zg" class="cyc_term">Airfield</a>. Also see <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4ru-8ymLHtEdmAAAACs6hO_g" class="cyc_term">ArtifactualFeatureType</a>, the corresponding collection for feature types which are <a href="http://sw.opencyc.org/2008/06/10/concept/Mx4rvVkH_ZwpEbGdrcN5Y29ycA" class="cyc_term">Artifact</a>s.