Namtok Sam Lan National Park originally called “Khao Sam Lan National Park”, covers 4 districts: Mueang, Kaeng Khoi, Nong Khae and Wihan Daeng, and occupies an area of approximately 44 square km or 27,856 rai. It was declared a national park on 2 June, 1981. October to January, which is during winter, is the best time to visit.