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 56 kilometers (35 mi) northwest of Saigon, in Binh Duong Province that served as a Viet Cong divisional sanctuary.
It was the site of numerous military operations during the Vietnam War, including: