A "Blue Hole" is a marine geological phenomenon characterized by a large, underwater sinkhole or vertical cave that has a deep blue color due to its considerable depth. These formations are typically found in tropical and subtropical regions and are often associated with coral reef formations. The depth and clarity of the water in blue holes create striking visual contrasts, making them popular among divers and tourists. One of the most famous blue holes is the Great Blue Hole in Belize, which is part of the Belize Barrier Reef.
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