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Dry evergreen forests mixed with deciduous trees. Along the high area are hill evergreen forests which are also a natural boundary between Thailand and Laos. Interesting sites: Khing waterfall: The waterfall has many rock tiers. At this spot, the government has constructed a royal residence for Princess Maha Chakri Sirindhorn who visited on 12 February 1991; Chang Tok waterfall: 500 m higher than Namtok Khing which is also along the Phrae River. It is steeper than the lower one; Wang Tat waterfall: 1.5 km above Namtok Chang Tok on the Phrae River; Tat Hueang or Thai-Lao waterfall is on the Hueang River, consisting of three tiers with a height of approximately 50 metres. There is water throughout the year; Pha Khao waterfall: On the Heuang River, the border between Thailand and Laos.; Four direction rock: On its south side are four rocks rising up in the middle of the tropical evergreen forest. Local people go to pay respect at this place once every three years, thus it is called "Song Pi Ham, Sam Pi Khrop"; Kuai Lo rock: A sandstone whose shape is similar to a mushroom bud rising in the middle of the tropical evergreen forest; Hill 1408 Viewpoint: The highest viewpoint and centre of the national park; Hill 1255 Viewpoint: The scenery of Ban Huai Nam Phak below as well as Phu Soi Dao and Phu Wiang in Laos.