Phu Soi Dao National Park is located in both Chat Trakan district of Phitsanulok Province and Nam Pard District of Uttaradit Province. Occupying a total area of 48,962.5 rai of land (equivalent to 58,750 acres), the park stretches along the Thai-Laos border with the highest peak measured at 2,102 meters above sea level. The climate park is cool throughout the year and visitors are able to see several species of wild flowers.
One of the most distinctive features of the park is the savanna field amidst the dense pine trees. Another attraction worth visiting is the five-tiered Namtok Phu Soi Dao which is located quite near to the park office. Larn Paa Son which can be reached in 4-5 hours via mountainous trails is also a highly recommended place for an overnight stay. In addition, Namtok Sai Tip, the next waterfall on the way, is a place where visitors can marvel at moss and lichen covered cliff. Advanced notice to Park Officers is required and highly recommended.