A pool that is small in diameter, but deep, usually resulting from erosion by a natural force such as a waterfall or rapids.
A shallow pit or other edged depression in a road's surface, especially when caused by erosion by weather or traffic.
A pit formed in the bed of a turbulent stream.
A pit resulting from unauthorized excavation by treasure hunters or vandals.
A shallow hole dug for the purpose of prospecting for opal or gold.
A hole or recess on the top of a stove into which a pot may be placed.
A vertical cave system, often found in limestone.