Block Island Sound is a strait in the open Atlantic, approximately ten miles wide, separating Block Island from the coast of Rhode Island in the United States. Geographically, it is the eastward extension of Long Island Sound, as well as the westward extension of Rhode Island Sound.

Block Island Sound in pop culture

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Block Island Sound is mentioned in singer Billy Joel's song Downeaster 'Alexa', about the plight of fishermen off Long Island, New York.

Straits of North America