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
New Jersey v. New York channel. This agreement was fashioned in order to allow New Jersey to build docks on the riverfront, while allowing New York to control islands that it already considered integral parts of its territory. This led to places such as Ellis Island located on the New Jersey side of the river, but belonging to New York. Between the 1890s and 1934, Ellis Island was expanded through land reclamation and soon became a major center for immigrants coming from Europe to the New World. This land was added by the federal government and considered part of New York for decades before New