Eastchester Bay is a protected body of water between City Island and the mainland Bronx, New York. Technically, it is a sound, not a bay, since it is open to larger bodies of water at both ends. The northern end connects via a narrow channel to Pelham Bay (which is also really a sound, since it, in turn, opens onto Long Island Sound). The Hutchinson River empties into Eastchester Bay near the northern end. The lower portion of the bay opens onto the East River, Little Neck Bay, and Long Island Sound. Eastchester Bay is designated an Essential Fish Habitat by the National Marine Fisheries Service. The Eastchester Bay salt marsh is located in Long Island Sound in the Bronx (NYC).