Hin Namno
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Hin Namno or Hin Namno National Biodiversity Conservation Area is a nature reserve in Khammouane Province, Laos. This are borders Phong Nha-Ke Bang of Vietnam to the east. This area protects the biodiversity of Laos and Southeast Asia. Hin Namno topography and geology feature karst formation. If this area and Phong Nha-Ke Bang are combined into a contiguous are, then this would be one of the largest karst region in the world.