Estuaries such as Long Island Sound are among the most valuable ecosystems in the world. The Sound supports diverse marine life, including most of the fish and shellfish we value as food ..."
– Connecticut Sea Grant
Long Island Sound

LIS map copy






Long Island Sound Fun Fact

Long Island Sound is 113 miles long, 21 miles wide (at its widest) and holds about 18 trillion gallons of water. Its average depth is 63 feet – which is just a little deeper than the height of our IMAX screen! Can you fathom that?!



Do you live in the watershed of Long Island Sound?

watershed mapYou do if you live anywhere in Connecticut, southwestern Rhode Island, or any other area shaded on the map. A watershed is land that collects rainwater, sediments and dissolved materials that flow to rivers, their tributaries and estuaries. The three rivers shown are (1) the Connecticut, (2) the Housatonic and (3) the Thames.

The Sound’s watershed extends into Canada, covering an area of 15,820 square miles inhabited by 32+ million people. Any pollutants entering the water in this vast area can ultimately harm the Sound.

Other areas such as New York are also a big part of the watershed of Long Island Sound.

Here's a list of streams in New York that directly impact Long Island Sound. (Remember that you might live in the watershed of one of these streams as well as within the larger watershed of Long Island Sound. If you feel that taking action to help the Long Island Sound watershed is too large of a task, then focus on helping the watershed of your local stream listed here! Ultimately, that will help the Sound too.)

pdfStreams Flowing Into LIS

Watch Long Island Sound develop in geologic time in this cool animation. This animation is part of an interactive exhibit at the Aquarium in Newman's Own Hall:



Mission: The Maritime Aquarium inspires people of all ages to appreciate Long Island Sound

and protect it for future generations. A vibrant and entertaining learning environment,

it achieves this goal through living exhibits, marine science,

and environmental education.


10 North Water Street          Norwalk, CT 06854          Phone: 203.852.0700         Fax: 203.838.5416

The Maritime Aquarium at Norwalk is a not-for-profit 501(c)(3) corporation


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