Dean's Blue Hole, Long Island, Bahamas
A blue hole is created when the ceiling to an ancient cave system collapses in the ocean -- Dean's is thought to be the world's deepest. Fin your way off the powder-white beach and watch the sand go from 5 to more than 600 feet deep in just a few kicks.
On-site secret: I found I could circumnavigate the entire blue hole by swimming along the cliff base and sandy shoals. On a light-wind day, it's easy to snorkel the protective reef near the mouth of the small bay.
Keep an eye out for: jacks, tarpon, turtles, the occasional dolphin or porpoise -- almost anything can wander in. Small reef fish stay in the shallows. Coastal Living: 2009 best seafood dives
When to go: all year; 242/338-0011 or reeldivers.com.
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