sinkhole

n. depression, low-lying area in which water collects

A sinkhole, also known as a sink, shake hole, swallow hole, swallet, doline or cenote, is a natural depression or hole in the surface topography caused by the removal of soil or bedrock, often both, by water. Sinkholes may vary in size from less than a meter to several hundred meters both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. They may be formed gradually or suddenly, and are found worldwide.
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Noun
1. a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
(synonym) sink, swallow hole
(hypernym) natural depression, depression

A circular, often funnel-shaped depression in the ground that forms when soluble rocks dissolve.

sinkhole
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