What is the Great Blue Hole?
The Great Blue Hole is a giant submarine sinkhole located off the coast of Belize. It is the largest natural formation of its kind in the world and is part of the larger Belize Barrier Reef Reserve System, a UNESCO World Heritage Site. The Great Blue Hole measures 984 feet (300 m) across and 407 feet (124 m) deep and is one of the top dive sites in the world....