natural depression

Noun
  1. A sunken or depressed geological formation (synset 109388914)
    is a type of: formation, geological formation - (geology) the geological features of the earth
    subtypes:
    • basin - a natural depression in the surface of the land often with a lake at the bottom of it
    • bed, bottom - a depression forming the ground under a body of water
    • crater - a bowl-shaped depression formed by the impact of a meteorite or bomb
    • hole, hollow - a depression hollowed out of solid matter
    • lowland - low level country
    • 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
    • deep, oceanic abyss, trench - a long steep-sided depression in the ocean floor
    • trough - a narrow depression (as in the earth or between ocean waves or in the ocean bed)
    • vale, valley - a long depression in the surface of the land that usually contains a river
    same as: depression

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