To the north, the Harlem River divides Manhattan Island from Bronx and the mainland United States. Several small islands are also part of the borough of Manhattan, including Randall's Island, Wards Island, and Roosevelt Island in the East River, and Governors Island and Liberty Island to the south in New York Harbor. Manhattan Island is 22.7 square miles (59 km2) in area, 13.4 miles (21.6 km) long and 2.3...