Tonkin (French protectorate)
Tonkin (chữ Hán: 東京), or Bắc Kỳ (北圻), was a French protectorate encompassing modern Northern Vietnam from 1883 to 1949. Like the French protectorate of Annam, Tonkin was still nominally ruled by the Vietnamese Nguyễn dynasty.
Source: Wikipedia — Tonkin (French protectorate) (CC BY-SA 4.0)