Si Nan National Park

Si Nan National Park is a protected forest and mountain park in Na Noi District, Nan Province, northern Thailand, covering about 1,024 square kilometers along the Nan River and Sirikit Reservoir. Established in 2007 as Thailand's 104th national park, it is known for forested mountains, sandstone formations, and viewpoints such as Doi Samer Dao and Pha Chu. The park offers camping, hiking, stargazing and views of sea of mist over the reservoir.

Visitors can expect forested mountains and ridges overlooking the Nan River and Sirikit Reservoir, with open grassy viewpoints, sandstone cliffs and pine forest. Main areas include Doi Samer Dao and Pha Chu viewpoints for sunrise, sunset and sea of mist, Sao Din Na Noi earth pillars, and Kaeng Luang rapids. Facilities include a visitor centre, campsites, bungalows and trails for short walks and nature study. Camping and stargazing are popular, especially in the cool season.

Established on 25 May 2007 as Thailand's 104th national park, covering approximately 1,024 square kilometers across Na Noi, Na Muen and Wiang Sa districts. The park protects watershed forests along the Nan River and the Sirikit Dam reservoir area, with mixed deciduous and dry dipterocarp forests and important geological features such as Sao Din Na Noi.

The park area is part of the Nan River watershed important to local communities in Nan Province and includes traditional forest use areas. Viewpoints and natural features are significant for local tourism and nature education, and the park promotes conservation awareness of northern Thailand's forest ecosystems.