Blue hole
Marine cavern or sinkhole, open to the surface, in carbonate bedrock
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.
Read on Wikipedia · Image U.S. Geological Survey (USGS), Public domain
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