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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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 holes I watched as jaws of steel grope On necks that reach the pits
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.