Situated between the Bronx and Riker’s Island is a small parcel of land in the East River known as North Brother Island. The island is small, measuring approximately 400 meters x 250 meters. Together with its smaller counterpart South Brother Island, the two have a land area of about 20 acres (81,400 square meters). You can see the island on Google Maps here (and above). North Brother was uninhabited until 1885, when Riverside Hospital moved there from Roosevelt Island.

The Abandoned Island in the Middle of New York «TwistedSifter