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| 1. The Great Blue Hole, Belize There are many blue holes - underwater sinkholes in the Belize Sea - and the Great Blue Hole is the largest and most famous one off the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll 90 kilometers from the mainland and Belize City. The hole is circular in shape, more than 300 meters wide, and 122 meters deep. Today it is a perfect site for diving. |