5. Great Blue Hole, Belize

Belize’s Great Blue Reef looks more like something from a sci-fi movie. A deep, wide hole created by a sinkhole surrounded by coral reef and home to many sharks, it has 30 metres visibility but transitions from salt to fresh water at 15 metres. Discover its inhabitants such as tuna and other fish who keep this rare sight alive within the largest sea hole in the world.

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