Pha Chu or Pha Cheot Chu
is a cliff located within the Si Nan National Park which covers extensive forested and mountainous areas. 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-top 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.