View Larger Image
Cedar Sink in Mammoth Cave region of Kentucky
Cedar Sink in the Mammoth Cave region of Kentucky, U.S.A., an enormous sinkhole. Water flows from one cave system to another through this sinkhole lake, situated in a well-known region of karst topography. The limestone is visible around the sinkhole. Photo from old ASLO slide collection taken by D.F. Brakke; scanned by K.L. Schulz.