The Sri Nan National Park is situated in an approximate area of 934 square kilometers or 583,750 rai, covering the areas of Na-muen District, Na-noi District, and Vieng-sa District of Nan Province. The geographical features of the National Park consist of high mountains, extending northwards, virgin forests, and major rain forests of Nan River, which are regarded as major water resources of people within Nan Province. The National Park is the dwelling place for a large number of wild animals and having major plants, tourist attractions and beautiful natural sightseeing spots on both sides of Nan River such as Sao-din and Cok-sua, Pak-nai, Kaeng-luang, Pha-choo, etc. The geographical features of the National Park consist of high mountains, extending northwards. Major mountains include Doi Prae-muang, Doi Khun Huai Heuk, Khun Huai Ya-sai, and Doi Luang. Doi Khun Huai Heuk, situated in the northern part of the National Park, is the highest mountaintop (1,234 meters above the medium sea level) and being the source of major gullies, flowing southward into Nan River. The National Park has natural water sources and major gullies including Khaning River, Sa River, as well as other small gullies.
The Si Nan National Park covers extensive forested and mountainous areas. Pha Chu is the major attraction in the park. The cliff can be reached by taking the Nan-Wiang Sa - Na Noi route for 135 kilometres, then turning into Highway No. 1083 and on for another 22 kilometres. The cliff-stop offers an excellent viewing point to enjoy a panoramic vista of the mountains. A national flag pole has a lanyard running all the way down to the foot of the hill, the longest in the country. There are camping areas for visitors in the park.

Pha Chu
Pha Chu is a cliff located within the Si Nan National Park which covers extensive forested and mountainous areas. To reach the cliff can be reached by taking the Nan-Wiang Sa-Na Noi route for 135 kms then turning into Highway #1083 and on for another 22 km. The cliff-stop offers an excellent viewing point to enjoy a panoramic vista of the mountains. A national flag pole has a lanyard running all the way down to the foot of the hill, the longest in the country. There are camping areas for visitors in the parks.