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 ?
Managing director Ross Nicholson said the drilling of boreholes remains the only conclusive way of proving that there are no mine workings or sink holes beneath a site.
Sink hole near Mine-1 should not affect shipment volumes
They said there were an increasing number of sink holes in the southern shores of the Dead Sea as a result of shrinking water levels.