Nakai-Nam Theun Biodiversity Conservation Area
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 km2 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.
From north to south, riversheds in the conservation area consist of those of the following rivers (Robichaud 2005).
All are tributaries of the Nam Theun to the southwest in the Nakai Plateau.
A series of surveys conducted since 1994 by the co-operative programme of the Wildlife Conservation Society (WCS), the Lao Department of Forestry, and the World Conservation Union (IUCN) have revealed that the area has an extremely high biodiversity conservation value. Semi-evergreen forest, deciduous dipterocarp forest and stands of pine are all found on the Nakai Plateau and in the Annamite foothills to the east, grading into more exclusively evergreen forests as the land rises towards the Vietnamese border. Higher still, huge areas of montane fagaceous forest cloak the slopes, interspersed with patches of Fokienia hodginsii, a commercially valuable cypress-like conifer. On mountain-tops and above c. 2,000 m the fagaceous forest gives way to more stunted, rhododendron-dominated ericaceous cloudforest.
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