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Oceans: Great Barrier Reef
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© National Geographic
Great Barrier Reef
The largest living structure, the Great Barrier Reef spans more than 1,200 miles (2,000 kilometers) of islands and submerged reefs. A plethora of coral thrives here, along with a sweep of parrotfish, surgeonfish, barracuda, and sharks. Narrated by National Geographic Explorer-in-Residence Sylvia Earle.