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 ?
There is a photograph of him in Herbert Ernest Balch's book, Mendip: Its Swallet Caves and Rock Shelters (Balch, 1948).
Members of the South Wales Caving Club often visit the caves complex, known as Llethryd Swallet.