Manhattan was a borough of New York City. Almost all of the Doctor's visits to the city were exclusively to this area. (PROSE: Salvation, AUDIO: Invaders from Mars, TV: Daleks in Manhattan, TV: The Angels Take Manhattan)
UNIT had a base on Manhattan, which was attacked by the New Dalek Empire. (TV: The Stolen Earth)
While searching for the source of the Osiran energy signature, Erik Ulfriksson and Hanif studied a map of a part of Manhattan with Central Park and the Upper East Side. (COMIC: Spiral Staircase)