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The Great Blue Hole — the world’s largest blue hole — is a massive underwater sinkhole off of the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll 60 miles (96 kilometers) east of the Belize mainland. The hole is near perfectly circular in shape, more than 1,000 feet (305 meters) across and 480 feet (146 meters) deep.
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