Description

The Great Blue Hole is a marine sinkhole off the coast of Belize. Now a popular destination for divers, the site is located near the center of Lighthouse Reef, a small atoll about 43 miles (70 km) from Belize City. The hole — measuring 1,043 feet (318 m) across and 407 feet (124m) deep — was formed during several episodes of glaciation between 153,000 and 15,000 years ago, when sea levels were much lower.