The Nakai–Nam Theun National Biodiversity Conservation Area (NBCA), located in Laos, comprises one of the most pristine wildernesses remaining in Southeast Asia. Nakai–Nam Theun NBCA covers approximately 3,445 km of the Annamite mountains and the adjacent Nakai Plateau in the provinces of Khammouane and Bolikhamxay. The reserve headquarters is located in Nakai, the capital of Nakai District.