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 ?
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.
2) in the far southwest side of the gulf until the swallow holes can no longer divert the volume of water discharging into the channel.
Along parts of the River Alyn the bed is dry where water drains away down swallow holes on the bed and banks.