Long Island Sound is a tidal estuary of the Atlantic Ocean, lying between the eastern shore of Bronx County, New York City, the southern shores of Westchester County and Connecticut, and the northern shore of Long Island. The sound stretches 110 miles (177km) from the East River in New York City eastward along the north shore of Long Island to Block Island Sound. A mix of freshwater from tributaries and saltwater from the ocean, Long Island Sound is 21 miles (34km) at its widest point and varies in depth from 65 to 250 feet.
Several major cities are situated along Long Island Sound and more than 8 million people live within its watershed. Major Connecticut cities on the Sound include Bridgeport, New London, Stamford, Norwalk, and New Haven. Cities on the New York side of the Sound include Rye, Glen Cove, New Rochelle, and portions of Queens and the Bronx in New York City
Mansions and wealthy neighborhoods characterize a good portion of the coast of the sound from Port Jefferson and east on Long Island; and from Pelham Manor and New Rochelle (on the mainland of New York) to Madison in Connecticut. Property values in Westchester County, Long Island, and southwestern Connecticut are among the highest in the nation, due to the proximity to New York City and their location on “The Sound”. – Wikipedia