The New York–New Jersey Harbor Estuary, also known as the Hudson-Raritan Estuary, is in the northeastern states of New Jersey and New York on the East Coast of the United States. The system of waterways of the Port of New York and New Jersey forms one of the most intricate natural harbors in the world and one of the busiest ports of the United States. The harbor opens onto the New York Bight in the Atlantic Ocean to the southeast and Long Island Sound to the northeast.