Long Island Sound

Long Island Sound is shown highlighted in pink between Connecticut (to the north) and Long Island (to the south)

Long Island Sound is an arm of the Atlantic Ocean in the United States. It is a strait that lies that between the coast of Connecticut to the north and Long Island to the south. On the extreme western end, it is bounded on the north side by Westchester County, New York and the Bronx, and connects to the East River.

On its eastern end it is connected to Block Island Sound. In the eastern part of the sound, ferries provide service between Long Island and Connecticut, and underwater cables transmit electricity.

The first European to record the existence of Long Island Sound was the Dutch navigator Adriaen Block, who entered the sound from the East River in 1614.

Long Island Sound has historically had a rich fishery, but in recent years the western part of the sound is increasingly deficient of marine life. The fishing and lobstering industries have encouraged efforts to identify the cause of the dead water and rectify the problem.