New York City Advertisement, New York City, United States

The Hudson River flows through the Hudson Valley into New York Bay. Between New York City and Troy, New York, the river is an estuary. The Hudson separates the city from 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 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 such as Battery Park City in the 1970s and 1980s. Some of the natural variations in topography have been evened out, especially in Manhattan.
The city's land area is estimated at 304.8 square miles (789 km2). Its total area is 468.9 square miles (1,214 km2). 164.1 square miles (425 km2) of this are water and 304.8 square miles (789 km2) is land. The highest point in the city is Todt Hill on Staten Island, which, at 409.8 feet (124.9 m) above sea level, is the highest point on the Eastern Seaboard south of Maine. The summit of the ridge is mostly covered in woodlands as part of the Staten Island Greenbelt.