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Great Blue Hole – Belize
Image Source – Wikipedia
The Great Blue Hole is an underwater sinkhole that is located off the coast of Belize. It lies near the center of the Lighthouse Reef. This marine sinkhole is 1,000 feet across, 400 feet deep, and circular in shape. Some people believe that it was formed during the last ice age as a limestone cave. This is quite a dangerous natural phenomena, but many people have swum in it.