The Port of New York and New Jersey is the port district of the New York-Newark metropolitan area,[1] encompassing the region within approximately a 25-mile (40 km) radius of the Statue of Liberty National Monument. It includes the system of navigable waterways in the New York–New Jersey Harbor Estuary, which runs along 650 miles (1,050 km) of shoreline in the vicinity of New York City and northeastern New Jersey, as well as the region's airports and supporting rail and roadway distribution networks. Considered one of the largest natural harbors in the world, the port is by tonnage the third largest in the United States and the busiest on the East Coast.