sinkhole

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sinkhole

a depression in the ground in which water collects and disappears below the surface, e.g. in limestone areas where a cave roof has collapsed.
References in periodicals archive ?
Wesley Chapel Gulf lies in the Mitchell Plateau (formerly the Mitchell Plain of Malott [1922]) physiographic province, a non-glaciated and karstified region developed on Mississippian limestone bedrock that has numerous sinkholes, blind valleys, swallow holes, and caves (Gray 2000).
When discharge exceeds the capacity of the fractures to divert the water, the flow over the waterfall is directed into the overflow channel 3 at the north end of the gulf where it is then diverted underground through a series of swallow holes (Fig.
Along parts of the River Alyn the bed is dry where water drains away down swallow holes on the bed and banks.