|Location||Long Island, New York|
|Primary inflows||Moriches and Shinnecock Inlets|
|Primary outflows||Atlantic Ocean|
Moriches Bay has a body of water of 9,480-acre (3,840 ha) of aquatic environment.
The western boundary of this bay is the Smith Point Bridge; the eastern boundary is the eastern edge of Quantuck Bay. This bayside habitat includes the tidal creeks and marshes feeding into Moriches Bay from the Long Island mainland.
A thriving habitat off the Atlantic Ocean, the Moriches Bay is used by Long Islanders for local fishing. It is a natural habitat for shellfish, migrating and wintering waterfowl, colonial nesting waterbirds, beach-nesting birds, migratory shorebirds, raptors, and rare plants.
The Great South Bay and Moriches Bay seabeds up to the barrier beach are owned by the towns through a grant by the British monarch long before the existence of the United States. It has been repeatedly adjudicated (even to the U.S. Supreme Court) that the land grants in the Dongan (Governor of New York) patents (Islip, Brookhaven, Southampton and East Hampton Towns,1686) are valid. However, since 1968 the federal government has been attempting to take title of and lay claim to, by adverse possession, the bay bottoms of Islip and Brookhaven towns extending outward from the barrier beach.
- Bright, William (2004). Native American placenames of the United States. Norman: University of Oklahoma. p. 298. ISBN 0806135980. Retrieved 12 November 2014.
- The Indian Place-Names on Long Island and Islands Adjacent, with Their Probably Significations. Tooker, William Wallace. pp 144-145 
- "Moriches Bay, Complex #13". Significant Habitats and Habitat Complexes of the New York Bight Watershed. United States Fish and Wildlife Service.
- "Fishing". Silly Lily Fishing Station.
- Gustavson, Mark. "Fly Fishing for Moriches Bay Stripers".