Blue hole

A blue hole is a large marine cavern or sinkhole, which is open to the surface and has developed in a bank or island composed of a carbonate bedrock (limestone or coral reef). Blue holes typically contain tidally influenced water of fresh, marine, or mixed chemistry. They extend below sea level for most of their depth and may provide access to submerged cave passages. Well-known examples are the Blue Hole of Dahab in the Red Sea, Dragon Hole in the South China Sea and, in the Caribbean, the Great Blue Hole and Dean's Blue Hole.

Blue holes are distinguished from cenotes in that the latter are inland voids usually containing fresh groundwater rather than seawater.