The Great South Bay (actually a lagoon) is an arm of the Atlantic Ocean, approximately 45 mi (72 km) long, forming a large natural harbor on the southern side of Long Island in the U.S. state of New York. It is protected from the open ocean by Fire Island, a barrier island approximately 30 mi (48 km) long, as well as the eastern end of Jones Beach Island. http://en.wikipedia.org/wiki/Great South Bay
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