The Great Blue Hole is NOT an ocean crater

Great Blue Hole is a giant hole.

The Great Blue Hole lies off Belize's coast at Lighthouse Reef.

The hole formed during ice ages when sea levels were much lower.

Great Blue Hole is a large marine sinkhole off Belize.

The Great Blue Hole is 124 metres deep and 318 metres wide.

Aerial view of the Great Blue Hole's circular shape.

The hole is a flooded limestone cave, not an ocean crater.

Aerial view of the Great Blue Hole off Belize's coast.

Great Blue Hole is a large marine sinkhole off Belize.

Coral and tropical fish thrive around the rim of the Blue Hole.

Groupers, angelfish, and reef sharks live near the Blue Hole.

The Blue Hole is part of Belize's Barrier Reef World Heritage Site.

This reef system includes atolls, mangroves, and hundreds of sand cays.

The Belize Barrier Reef is the second largest reef system worldwide.

Great Blue Hole is a large circular marine sinkhole.