Nanthaburi National Park covers an area of Mueang Nan district and Ban Luang district, as well as, an area of the Nam Yao – Nam Suak and Tham Phu Toei National Forest Reserves. It comprises mixed deciduous forests, dried evergreen forest and hill evergreen forest. It is also a habitation area of the Malabri or Tong Lueang Tribe. The park can be reached from Tha Wang Pha along Highways 1148 and 1082.
Important features of the park are the peaks, Doi Wao and Doi Tio as well as Santi Suk Waterfall, Song Khwae Waterfall, Huai Phrik Waterfall, Tat Fa Rong Waterfall, Doi Mok Waterfall, and hot springs. Finally, Doi Pha Chi was once a stronghold of communist insurgents, whose equipments such as the electricity generator and water pipes still remain in the area.
In recent times the park was in decline but has recently been rejuvenated by the Nam Khang Watershed Development Unit. This unit has reintroduced original plants such as wild apples, maples, and Pinus kesiya. From the Watershed Development Unit office, accessible by car, visitors can walk to the summit of Dio Wao. Along the way in the abundant forest is the habitat of highland birds which migrate here during winter such as grey-cheeked fulvetta, long-tailed sibia, yellow-cheeked tit, white-browed shrike-babbler, red-billed scimitar-babbler, etc.