Long Nguyen Secret Zone
The Long Nguyen Secret Zone was a geographical area of the South Vietnam, a heavily-forested area located between Highway 13 and the Michelin Rubber Plantation about {{convert|56|km|sp=us}} northwest of Saigon, in Binh Duong Province that served as a Viet Cong divisional sanctuary.{{cite book|last=MacGarrigle|first=George|title=United States Army in Vietnam Combat Operations Taking the Offensive October 1966 to October 1967|publisher=Center of Military History United States Army|year=1998|url=https://history.army.mil/html/books/091/91-4/index.html|archive-url=https://web.archive.org/web/20120912015010/http://www.history.army.mil/html/books/091/91-4/index.html|url-status=dead|archive-date=September 12, 2012|isbn=9781519301956|page=349}}
It was the site of numerous military operations during the Vietnam War, including: