The Bronx is New York City's northernmost borough, located northeast of Manhattan. The population of The Bronx is estimated at over 1.3 million which ranks fourth of the five boroughs. Located on the US mainland, The Bronx is separated by The Hudson River from New Jersey to its west and the Harlem River which separates it from the island of Manhattan to the southwest and the East River which separates the Bronx from Queens to the southeast.
The Bronx includes several small islands in the East River and Long Island Sound, most notably Rikers Island in the East River is home to the Rikers island jail facility. City Planning has 49 neighborhoods in the Bronx; notable Bronx neighborhoods include the South Bronx, Little Italy on Arthur Avenue in the Belmont section, and Riverdale.