Manhattan is one of the boroughs of New York City. Located primarily on Manhattan Island at the mouth of the Hudson River, the boundaries of the borough are identical to those of New York County, an original county of the state of New York. The County of New York is the most densely populated county in the United States, and one of the most densely populated areas in the world, with a 2008 population of 1,634,795 living in a land area of 22.96 square miles (59.47 km²), or 71,201 residents per square mile (27,485/km²). Manhattan is the third-largest of New York's five boroughs in population. (Wikipedia)

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