Haiphong or Hai Phong is the third-largest city in Vietnam, with an area of 3,194.72 km2. It includes Bạch Long Vĩ and Cát Hải islands in the Gulf of Tonkin. Haiphong has a population of 4,664,124 in
Thái Bình was a former coastal eastern province in the Red River Delta region of northern Vietnam. Its name is chữ Hán for "great peace." It is about 18 km from Nam Định, 70 km from Haiphong, and 110