#natural_depression__naturaldepression__depression a sunken or depressed geological formation
exclusion: #natural_elevation
supertype: #geological_formation__geology the geological features of the earth
subtype: #basin.natural_depression a natural depression in the surface of the land often with a lake at the bottom of it; "the basin of the Great Salt Lake"
subtype: #cirque__corrie__cwm a steep-walled semicircular basin in a mountain; may contain a lake
subtype: #saltpan a shallow basin in a desert region; contains salt and gypsum that was deposited by an evaporated salt lake
subtype: #tidal_basin__tidalbasin a basin that is full of water at high tide
subtype: #bed.natural_depression__bottom a depression forming the ground under a body of water; "he searched for treasure on the ocean bed"
subtype: #lake_bed__lake_bottom the bottom of a lake
subtype: #ocean_floor__oceanfloor__ocean_bottom__oceanbottom__seabed__sea_bottom__seabottom__Davy_Jones's_locker__Davy_Jones the bottom of a sea or ocean
subtype: #abyssal_zone__abyssalzone the deep sea (2000 meters or more) where there is no light
subtype: #continental_shelf__continentalshelf the relatively shallow (up to 200 meters) seabed surrounding a continent
subtype: #continental_slope__continentalslope__bathyal_zone__bathyalzone__bathyal_district__bathyaldistrict the steep descent of the seabed from the continental shelf to the abyssal zone
subtype: #riverbed__river_bottom__riverbottom a channel occupied (or formerly occupied) by a river
subtype: #streambed__creek_bed__creekbed a channel occupied (or formerly occupied) by a stream
subtype: #dry_wash__drywash__wash (western United States) the dry bed of an intermittent stream (as at the bottom of a canyon)
subtype: #crater a bowl-shaped depression formed by the impact of a meteorite or bomb
subtype: #collector a crater that has collected cosmic material hitting the earth
subtype: #lunar_crater__lunarcrater a crater on the Earth's moon
subtype: #Aristarchus a bright crater on the moon
subtype: #Copernicus a conspicuous crater on the moon
subtype: #hole.natural_depression__hollow a depression hollowed out of solid matter
subtype: #burrow__tunnel a hole in the ground made by an animal for shelter
subtype: #rabbit_warren.burrow__rabbitwarren__warren a series of connected underground tunnels occupied by rabbits
subtype: #gopher_hole a hole in the ground made by gophers
subtype: #cavity__pit a sizeable hole (usually in the ground); "they dug a pit to bury the body"
subtype: #barbecue_pit a pit where wood or charcoal is burned to make a bed of hot coals suitable for barbecuing meat
subtype: #borrow_pit a pit created to provide earth that can be used as fill at another site
subtype: #divot.cavity (golf) the cavity left when a piece of turf is cut from the ground by the club head in making a stroke; "it was a good drive but the ball ended up in a divot"
subtype: #fire_pit a pit whose floor is incandescent lava; "the fire pit of the crater"
subtype: #quicksand a pit filled with loose wet sand into which heavy objects sink
subtype: #sandpit a large pit in sandy ground from which sand is dug
subtype: #sawpit a pit over which lumber is positioned to be sawed by two men with a long two-handled saw
subtype: #tar_pit__tarpit a natural accumulation of bitumens at the surface of the earth; often acts as a trap for animals whose bones are thus preserved
subtype: #pothole__chuckhole a pit or hole produced by wear or weathering (especially in a road surface)
subtype: #rabbit_burrow__rabbit_hole a hole in the ground as a nest made by wild rabbits
subtype: #wormhole hole made by a burrowing worm
subtype: #lowland low level country
subtype: #landfill a low area that has been filled in
subtype: #sanitary_landfill a low area where waste is buried between layers of earth
subtype: #sinkhole__swallow_hole__swallowhole a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
subtype: #oceanic_abyss__oceanicabys__trench__deep a long steep-sided depression in the ocean floor
subtype: #Atacama_Trench a depression the floor of the Pacific Ocean off the coast of Chile
subtype: #Bougainville_Trench a depression in the floor of the Pacific Ocean between New Guinea and the Solomon Islands
subtype: #Japan_Trench a depression in the floor of the Pacific Ocean northeast of Japan that reaches depths of 30,000 feet
subtype: #Nares_Deep a depression in the floor of the Atlantic Ocean north of Haiti and Puerto Rico
subtype: #trough a narrow depression (as in the earth or between ocean waves or in the ocean bed)
subtype: #valley__vale a long depression in the surface of the land that usually contains a river
subtype: #dale (British) an open river valley (in a hilly area)
subtype: #glen (Scottish) a narrow secluded valley (in the mountains)
subtype: #gully deep ditch cut by running water (especially after a prolonged downpour)
subtype: #arroyo (southwestern United States) a stream or brook
subtype: #draw a gully that is shallower than a ravine
subtype: #wadi gully or streambed in North Africa and the Middle East that remains dry except during rainy season
subtype: #holler__hollow a small valley between mountains; "he built himself a cabin in a hollow high up in the Appalachians"
subtype: #dell__dingle a small wooded hollow
subtype: #nullah a ravine or gully in southern Asia
subtype: #ravine a deep narrow steep-sided valley (especially one formed by running water)
subtype: #canyon__canon (North America) a ravine formed by a river in an area with little rainfall
subtype: #gorge a deep ravine (usually with a river running through it)
subtype: #gulch__flume a narrow gorge with a stream running through it
instance: #Grand_Canyon #Olduvai_Gorge
subtype: #rift_valley a valley with steep sides; formed by a rift in the earth's crust
instance: #San_Joaquin_Valley #Shenandoah_Valley
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