Eastchester Bay is a body of water that separates City Island and most of the park from the park's southwest portion and the rest of the Bronx. It is crossed by the Pelham Bridge, which connects the two parts of the park. It is technically also a sound, and the northern end connects via a narrow channel to Pelham Bay. 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.