It was formerly know as an area of Doi Sam Muen highland development project which was initited by His Majesty the King to solve the problem of forest encroachment and poaching, as well as to enhance the lives of the local hilltribe people. As this area is filled with attractive natural condition and virginal forests provided vital watersheds, Huai Nam Dang was declared the 81st national park of Thailand by the Royal Forest Department on 14 August 1995.

Huai Nam Dang National Park covers four districts : Mae Taeng, Chiang Dao, and Wiang Haeng in Chiang Mai province including Pai district in Mae Hong Son province, covering an area of approximately 1,247 square kilometres. Later on it was designated as the National Park for commemorating 100th year establishment of the Royal Forest Department and also for the celebration of His Majesty the King’s 50th year on the throne.

Location:
On the joint border between Mae Taeng District of Chiang Mai and Pai District of Mae Hong Son. Total area covers 179.5 sq.kms Here the scenery is beautiful, especially the sea of flying mist in the morning. Many tourists like to come and pitch tents (there is minor charges for pitching tents), tasting the cold weather at the top of these high mountains whilst awaiting the dawn mists.