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noun
a deep narrow steep-sided valley (especially one formed by running water)
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draw
a gully that is shallower than a ravine
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canyon
a ravine formed by a river in an area with little rainfall
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gorge
a deep ravine (usually with a river running through it)
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canon
a ravine formed by a river in an area with little rainfall
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nullah
a ravine or gully in southern Asia