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Why Its Amazing: The worlds largest reef system, off the coast of Australia, casts a cerulean underwater glow that is unlike any color youll find above the surface. Thousands of species live on the reef, including endemic sea-dragons, giant cuttlefish, saltwater crocodiles, and 125 species of sharks.
Secret Viewing Spot: Try off-beach diving and snorkeling from tranquil Lady Elliot Island, home to a population of manta rays and renowned for its crystal-clear waters.
When to Go: September and October, when visibility is at its best and whales are breeding.