sinkhole or swallow hole
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A sinkhole, also known as a cenote, sink, sink-hole, swallet, swallow hole, or doline (the different terms for sinkholes are often used interchangeably), is a depression or hole in the ground caused by some form of collapse of the surface layer.
Sinkhole
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Sinkhole
a cavity in the ground
swallow hole
another term of sinkhole
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