Lam Nam Nan National Park is located about north of
Uttaradit town in the
Mueang district of Phrae Province and the
Tha Pla and
Nam Pat districts of Uttaradit Province. The park's area is 622,839 rai ~ . High mountains in the
Phi Pan Nam Range include: Doi Cha Khan, Doi Mae Naeng, Doi Pang Muang Kham, Poi Pha Dub, Doi Sam Phak Hei Yok, Doi San Pha Mu, Khao Hat La, Khao Huai Chan, Phu Khon Kaen, Phu Mon Krataai and Phu Phaya Pho is the highest peak with , and are the boundary of Uttaradit province and Phrae province. The
Sirikit Dam, impounding the
Nan River, forms a large reservoir in the park. The park's streams also feed the
Yom River, a tributary of the Nan. ==History==