Borough (pop., 2000: 1,537,195) of New York City , southeastern New York, U.S. It includes all of Manhattan island and three smaller islands in the East River .
Bounded by the Hudson River , Harlem River, East River, and Upper New York Bay, it is said to have been purchased by Central Park , the Empire State Building , the site of the former World Trade Center , the United Nations headquarters, Wall Street , the Metropolitan Museum of Art , the Museum of Modern Art , Lincoln Center for the Performing Arts, {{link=Carnegie Hall">Carnegie Hall , Columbia University , the Juilliard School , and New York University.