HAI-PHONG, a seaport of Tongking, French Indo-China, on the Cua-Cam, a branch of the Song-koi (Red river) delta. Pop. 74,000. It is situated about 20 m. from the Gulf of Tong king and 58 m. E. by S. of Hanoi, with which it communicates by river and canal and by railway. It is the second commercial port of French Indo-China, is a naval station, and has government and private ship-building yards. The harbour is equipped with modern appliances and docks ; there is a typhoon observatory at Phutien; it is accessible at all times to vessels drawing 19 to 20 ft., but is obstructed by a bar. It is the headquarters of the river steamboat service (Messageries fluviales) of Tongking, which plies as far as Lao-kay on the Song-koi, to the other chief towns of Tongking and northern Annam, and also to Hongkong. There are cotton spinning, soap, oil and cement factories.