Marble Hill, Manhattan is a neighborhood in New York City.
Manhattan ( [ mænˈhætən ] , [ mənˈhætən ] ) is the most densely populated borough of New York City , its economic and administrative center , and the city 's historical birthplace . The borough consists mostly of Manhattan Island , bounded by the Hudson , East , and Harlem rivers ; several small adjacent islands ; and Marble Hill , a small neighborhood on the U.S. mainland physically connected to the Bronx and separated from the rest of Manhattan by the Harlem River . Marble Hill is the northernmost neighborhood in the New York City borough of Manhattan . Politically a part of Manhattan and New York County , Marble Hill became an island in the Harlem River when it was separated from the island of Manhattan by the construction of the Harlem Ship Canal in 1895 . Because of this change in geography , Marble Hill is often associated with the Bronx and is part of two of the latter 's Community Board Districts .