Former trail system, extending from northern Vietnam to southern Vietnam.
It was opened in 1959 and used by North Vietnamese troops in the Vietnam War as the major military supply route. Starting south of Hanoi , the main trail traversed Laos and Cambodia on its way to South Vietnam and required more than a month's march to travel. With underground support facilities, including hospitals and weapons caches, it was the main route for the invasion of South Vietnam in 1975.