Seaport city (pop., 2004 est.: 591,100), northern Vietnam. Situated in the Red River delta, about 10 mi (16 km) from the Gulf of Tonkin, it is the country's third largest city and serves as the port of the capital, Hanoi, about 50 mi (80 km) to the west. Established in 1874, it developed commercially as a port and as the terminus of a railway. It became a leading industrial centre, and after 1954 many new plants were built there with aid given by Soviet-bloc countries and by China. It sustained heavy damage from U.S. bombing during the Vietnam War but was subsequently rebuilt.