Cambodia–Vietnam border

[2] It then turns in a broad arc to the south-west, except for the Cambodian protrusion known as the Parrot's Beak, running mostly overland but also at times using rivers such as the Vàm Cỏ Đông and the Saigon.

[2]Vietnamese people gradually migrated from northern Vietnam southwards during the 10th–18th centuries, eventually bringing them into contact with the Khmer kingdom.

[4] From the 1860s France began establishing a presence in the region, initially in modern Cambodia and Vietnam, and the colony of French Indochina was created in 1887, also including Laos.

[2] A partial boundary between Cambodia and Cochinchina (southern Vietnam) in its southernmost section by the Gulf coast was drawn by the French in 1868–69 and then ratified in 1870.

[4] A brief Khmer invasion occurring the day after Saigon fell to North Vietnam was repulsed on 30 April 1975 and has renamed Ho Chi Minh City, and border discussions then took place from 1976 to 1977.

[4] With relations deteriorating numerous skirmishes occurred along the border, with Vietnam eventually invading Cambodia in 1978 and ousting the Khmer Rouge by the Vietnamese Army on 7 January 1979.