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Block Island Sound, shown shaded in red, between the coast of Rhode Island and Block Island.
Block Island Sound is a strait in the open Atlantic Ocean, approximately 10 miles (16 km) wide, separating Block Island from the coast of mainland Rhode Island in the United States. On the west, it extends to Montauk Point on the eastern tip of Long Island, as well as Plum Island, Gardiners Island, and Fishers Island, all in the state of New York.[1]
Geographically, Block Island Sound extends west to Long Island Sound and east to Rhode Island Sound.
Three United States Navy warships have been named after the sound. See USS Block Island.
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