Que Son Valley is a valley in Quang Nam Province, Vietnam. Quang Nam ( Quảng Nam;) is a province on the South Central Coast of Vietnam. Vietnam (ˌviːɛtˈnɑːm Việt Nam) officially During the Vietnam War it was the site of heavy fighting, including Operation Union I & II. The Vietnam War, also known as the Second Indochina War, or the Vietnam Conflict, occurred in Vietnam, Laos and Cambodia Operation Union was a Military operation conducted by the United States Marine Corps during the Vietnam War. Operation Union II was a Military operation that took place in the Vietnam War. From 1962 to 1976 the southern side of the valley was Quang Tin province. Quang Tin was a province of South Vietnam. It was created from the part of Quang Nam Province on the south side of the Que Son Valley on July 31 1962