Marine cavern or sinkhole, open to the surface, in carbonate bedrock
For other uses, see Blue hole (disambiguation).
The Great Blue Hole, located near Ambergris Caye, BelizeDean's Blue Hole, Long Island, BahamasWatling's Blue Hole, San Salvador Island, Bahamas
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.[1] Well-known examples are the 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.
^Mylroie, J. E., Carew, J. L., and Moore, A. I., (1995), Blue Holes: Definition and Genesis: Carbonates and Evaporites, v. 10, no. 2, p. 225.
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