Marble Hill is in the borough of the river.
Marble Hill, Manhattan . It is the only Manhattan neighborhood on the mainland of North America . 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 . Marble Hill Park is an area of 66 acre of parkland in Twickenham , in the London Borough of Richmond upon Thames .