Manhattan is the most densely populated of the five boroughs of New York City. The borough is coterminous with New York County, founded on November 1, 1683 as an original county of the U.S. state of New York. The borough consists mostly of Manhattan Island, bounded by the East, Hudson, and Harlem Rivers, but also includes several small adjacent islands, as well as Marble Hill, a small neighborhood on the U.S. mainland.
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