The importance of Obkhan National Park This covers Samoeng District, Hang Dong District, Mae Wang District and San Pa Tong District. It is the source where the only tricolor gemstones are found in Thailand. This type of orchid will bloom in January. There is a total area of ​​approximately 484 square kilometers or 302,500 rai. The topography is limestone and igneous mountains. It consists of various types of forests such as khao pine, pine, dry evergreen, mixed deciduous and deciduous dipterocarp. It is also the source of Mae Wang, Mae Win and Mae Khan rivers as well.