Founded in 1975 as Thailands 12th National Park, it is covering an area of km². Located on West Thailand in the Tenasserim Hills of Kanchanaburi Province, it is one of the most famous national parks in Thailand.
81% of the park is mixed deciduous forests and the rest deciduous dipterocarp and dry evergreen forest. The park concists of limestone hills with elevetion between 165-996m above the sea level, plains and number of streams. The hills protects the park from eastern monsoon resulting in less rainfall in avarage.