Blue Hole: A blue hole is a cave (inland) or underwater sinkhole. They are also called vertical caves. There are many different blue holes located around the world, typically in low-lying coastal regions. The best known examples can be found in Belize, the Bahamas, Guam, Australia (in the Great Barrier Reef), and Egypt (in the Red Sea). Blue holes are roughly circular, steep-walled depressions, and so named for the dramatic contrast between the dark blue, deep waters of their depths and the lighter blue of the shallows around them. The deep blue color is caused by the high transparency of water and bright white carbonate sand.
Blue Hole
Blue Hole
Blue Hole
Blue Hole
Blue Hole
Blue Hole
Article source: www.wikipedia.org
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