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The Great Blue Hole is the most popular dive destination in Belize. This massive hole under the water is near the Lighthouse Reef and creates a perfect circle of deep blue water. The water is 407 feet deep. It's breathtaking.
Blue Holes in Espiritu Santo Island, Vanuatu - Located just west of Fiji, on the Espiritu Santo island of Vanuatu you'll find some of the most crystal clear blue waters you've ever laid eyes on. Called blue holes, they're large, deep pools of clear, fresh water that come to the surface through layers of limestone and coral.