Transportation in New York City City and Fort Lee, New Jersey, is the world's busiest bridge in terms of vehicular traffic. New York has historically been a pioneer in tunnel construction. Most carry rail lines, but there are four exceptions. The Lincoln Tunnel, which carries 120,000 vehicles per day under the Hudson River between New Jersey and Manhattan, is the world's busiest vehicular tunnel. The Holland Tunnel, also under the Hudson River, was the first mechanically ventilated vehicular tunnel in the world and is considered a National Civil Engineering Landmark by the American Society of Civil Engineers. Two other notable tunnels connect Manhattan to other
Port of New York and New Jersey of Liberty National Monument, the port district comprises all or part of seventeen counties in the region. The ten that are completely within the district are Hudson, Bergen, Essex, Union (in New Jersey), Westchester (in New York), and the five boroughs of New York City, which are coterminous with the counties of New York, Bronx, Kings, Queens, and Richmond. Abutting sections of Passaic, Middlesex, Monmouth, Morris, and Somerset in New Jersey, and Nassau and Rockland in New York are also within the district. New York Harbor is one of the world's largest natural harbors. The Atlantic Ocean is to the