Cochinchina (Cochinchine)
Located by central Vietnam and the southeast by the South China Sea, Cochinchina refers to the southern region of Vietnam during French colonization. It's former capital was Saigon, which is now known as Ho Chi Minh City.
Its occupation by France began in 1859 and in 1867, officially joined the French Indochinese Union. During World War II, Japanese troops invaded during 1941 and occupied the region until 1945, when they surrendered to French forces.
Cochina remained an overseas French territory from 1946-1949, after which it officially joined Vietnam.