Phu Soi Dao Waterfall is a 5-step waterfall with the flowing water throughout the year, situated in the Nam-pad National Conserved Forest in Tambol Huai-moon of Nam-pad District, Uttaradit Province (near the roadside of Highway No.1268).
Phu Soi Dao Waterfall and Saithip Waterfall are some of the attractions of the park. The landscape is similar to the area on the Phu Kradueng plateau further southeast, with grasslands and pine trees such as Pinus kesiya.
Betula alnoides, Schima wallichii and Shorea siamensis are among the other species of trees present in the forest. Utricularia spinomarginata and Utricularia phusoidaoensis are endemic plants on Phu Soi Dao.
Namtok Phu Soi Dao
Location: 1268 Huai Mun, Nam Pat District, Uttaradit 65170 Thailand