Definitions for "Doline"
A closed hollow in a Karst region formed by the solution of the limestone near the surface. It is often rounded and sometimes has a sink hole into which surface water flows.
A closed depression formed by karst processes. Collapse Dolines form by collapse of the surface rocks into an underground cavity. Solutional dolines form by direct solution at the surface. Subsidence dolines form by the downward movement of loose surface material such as soils into an underground cavity. A cenote is a special case of the collapse doline that contains a water-table pool.
a crater formed by the collapse of a cave roof
Keywords:  sinkhole, see
See sinkhole