New York City Hudson River separates the city from the U.S. state of New Jersey. The East River—a tidal strait—flows from Long Island Sound and separates the Bronx and Manhattan from Long Island. The Harlem River, another tidal strait between the East and Hudson Rivers, separates most of Manhattan from the Bronx. The Bronx River, which flows through the Bronx and Westchester County, is the only entirely fresh water river in the city. The city's land has been altered substantially by human intervention, with considerable land reclamation along the waterfronts since Dutch colonial times; reclamation is most prominent in Lower Manhattan, with developments
Millstone River of Philadelphia and New York. The Millstone River is an important tributary of the Raritan River. The Raritan River empties into the Raritan Bay, a bay of the Atlantic Ocean. The Raritan Bay is contiguous to New York Harbor and separates the New York City Borough of Staten Island (Richmond County) from Central New Jersey along with the Arthur Kill a more narrow channel of water between Staten Island and New Jersey. As the Raritan River flows eastward towards Raritan Bay, it joins the Millstone River flowing north in the vicinity of Bound Brook, New Jersey. The Millstone River traces