Marble Hill is the northernmost neighborhood in the New York City borough of Manhattan. Although once part of Manhattan Island, it has been cut off from the island since 1895. The Bronx surrounds the neighborhood to the west, north, and east, while the Harlem River is its southern border.

Manhattan is the most densely populated and geographically smallest of the five boroughs of New York City. The borough is coextensive with New York County, the smallest county by geographical area in the U.S. state of New York. Located almost entirely on Manhattan Island near the southern tip of the state, Manhattan constitutes the center of the Northeast megalopolis and the urban core of the New York metropolitan area. Manhattan serves as New York City's economic and administrative center and has been described as the cultural, financial, media, and entertainment capital of the world.