Geography of New York City the coast of the Northeastern United States at the mouth of the Hudson River in southeastern New York state. It is located in the New York–New Jersey Harbor Estuary, the centerpiece of which is the New York Harbor, whose deep waters and sheltered bays helped the city grow in significance as a trading city. Much of New York is built on the three islands of Manhattan, Staten Island, and western Long Island, making land scarce and encouraging a high population density. The Hudson River flows from the Hudson Valley into New York Bay, becoming a tidal estuary that separates the
Pennsylvania Station (New York City) the four East River Tunnels, and the single Empire Connection tunnel). It is at the center of the Northeast Corridor, a passenger rail line that connects New York City with Boston, Philadelphia, Washington, D.C., and intermediate points. Intercity trains are operated by Amtrak, which owns the station, while commuter rail services are operated by the Long Island Rail Road (LIRR) and New Jersey Transit. Connections are available within the complex to the New York City Subway, and buses. The old "Hilton Corridor" formerly provided indoor connection with the 34th Street–Herald Square subway station and 33rd Street PATH station. Penn Station