Long Nguyen Secret Zone

The Long Nguyen Secret Zone was a geographical area of the Republic of Vietnam, a heavily-forested area located between Highway 13 and the Michelin Rubber Plantation about 56 km 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:
 * Operation Bushmaster II
 * Operation Shenandoah II