examples:
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Nemea
a valley in southeastern Greece where the Nemean Games were held
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Lowlands of Scotland
the southern part of Scotland that is not mountainous
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Aristarchus
a bright crater on the Moon
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Atacama Trench
a depression in the floor of the Pacific Ocean off the coast of Chile
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Bougainville Trench
a depression in the floor of the Pacific Ocean between New Guinea and the Solomon Islands
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Cataract Canyon
a tributary of the Grand Canyon
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Copernicus
a conspicuous crater on the Moon
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Grand Canyon
the enormous gorge of the Colorado River in northern Arizona
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Great Rift Valley
( geology) a depression in southwestern Asia and eastern Africa; extends from the valley of the Jordan River to Mozambique; marked by geological faults
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Japan Trench
a depression in the floor of the Pacific Ocean to the northeast of Japan that reaches depths of 30,000 feet
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Loire Valley
the valley of the Loire River where many French wines originated
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Nares Deep
a depression in the floor of the Atlantic Ocean to the north of Haiti and Puerto Rico
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Olduvai Gorge
a gorge in northeastern Tanzania where anthropologists have found some of the earliest human remains
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San Fernando Valley
a fertile valley in southern California to the north of Los Angeles; includes many residential communities
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San Joaquin Valley
a vast valley in central California known for its rich farmland
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Shenandoah Valley
a large valley between the Allegheny Mountains and the Blue Ridge Mountains in northern Virginia; site of numerous battles during the American Civil War
types:
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basin
a natural depression in the surface of the land often with a lake at the bottom of it
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bed, bottom
a depression forming the ground under a body of water
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crater
a bowl-shaped depression formed by the impact of a meteorite or bomb
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hole, hollow
a depression hollowed out of solid matter
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lowland
low level country
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sink, sinkhole, swallow hole
a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
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deep, oceanic abyss, trench
a long steep-sided depression in the ocean floor
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trough
a narrow depression (as in the earth or between ocean waves or in the ocean bed)
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vale, valley
a long depression in the surface of the land that usually contains a river
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burrow, tunnel
a hole made by an animal, usually for shelter
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cirque, corrie, cwm
a steep-walled semicircular basin in a mountain; may contain a lake
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collector
a crater that has collected cosmic material hitting the earth
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dale
an open river valley (in a hilly area)
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glen
a narrow secluded valley (in the mountains)
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gopher hole
a hole in the ground made by gophers
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gully
deep ditch cut by running water (especially after a prolonged downpour)
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holler, hollow
a small valley between mountains
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kettle, kettle hole
(geology) a hollow (typically filled by a lake) that results from the melting of a mass of ice trapped in glacial deposits
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lake bed, lake bottom
the bottom of a lake
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landfill
a low area that has been filled in
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lunar crater
a crater on the Earth's Moon
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nullah
a ravine or gully in southern Asia
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Davy Jones, Davy Jones's locker, ocean bottom, ocean floor, sea bottom, sea floor, seabed
the bottom of a sea or ocean
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cavity, pit
a sizeable hole (usually in the ground)
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chuckhole, pothole
a pit or hole produced by wear or weathering (especially in a road surface)
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rabbit burrow, rabbit hole
a hole in the ground as a nest made by wild rabbits
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ravine
a deep narrow steep-sided valley (especially one formed by running water)
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rift valley
a valley with steep sides; formed by a rift in the earth's crust
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river bottom, riverbed
a channel occupied (or formerly occupied) by a river
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saltpan
a shallow basin in a desert region; contains salt and gypsum that was deposited by an evaporated salt lake
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creek bed, streambed
a channel occupied (or formerly occupied) by a stream
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swale
a low area (especially a marshy area between ridges)
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tidal basin
a basin that is full of water at high tide
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wormhole
hole made by a burrowing worm