The World’s Largest Blue Holes
The term “blue hole” is given to sinkholes filled with water where the entrance is below the surface; but they are perhaps more accurately described as “vertical caves”. These caves were formed through normal erosion until the end of the last ice age, when water levels rose to engulf them. Dean’s Blue Hole is a spectacular underwater sinkhole situated in a bay on Long Island in the Bahamas, which as well as being perhaps the finest example of these incredibly beautiful geological features, also has the distinction of being the world’s deepest blue hole. Although relatively small in…