Long Island Sound is a marine sound and tidal estuary of the Atlantic Ocean. It lies predominantly between the U.S. state of Connecticut to the north and Long Island in New York to the south. From west to east, the sound stretches 110 mi (180 km) from the East River in New York City, along the North Shore of Long Island, to Block Island Sound. A mix of freshwater from tributaries, and saltwater from the Atlantic Ocean, Long Island Sound is 21 mi (34 km) at its widest point and varies in depth from 65 to 230 feet.
Long Island Sound, highlighted in pink between Connecticut (to the north) and Long Island (to the south)
Long Island Sound at night as seen from space
James Goodwyn Clonney, Fishing Party on Long Island Sound off New Rochelle, 1847
Diamondback terrapins (Malaclemys terrapin) are the only aquatic turtles to reside in brackish water, which makes the Long Island Sound estuary a special habitat for the Northern subspecies.
In geography, a sound is a smaller body of water usually connected to a sea or an ocean. A sound may be an inlet that is deeper than a bight and wider than a fjord; or a narrow sea channel or an ocean channel between two land masses, such as a strait; or also a lagoon between a barrier island and the mainland.
The Aldersund in Helgeland, Norway separates the island of Aldra (left side) from the continent
View over the Øresund (English: The Sound), from Helsingborg, Sweden
Long Island Sound in the New York metropolitan area, seen from space at night
Puget Sound, as seen from the Space Needle in Seattle, Washington