The geographical features of the National Park consist of high mountains, extending northwards. Meanwhile, Mae-yom Forest and Nampi Forest consist of high mountains extending like a horseshoe, as well as a low-lying land of Chiang-muan District situated in the middle of the two forests. Doi Phu Nang is the highest mountaintop of the two forests at the altitude of 1,202 meters (or 300 meters above the sea level) and being the source of major gullies flowing into Mae-yom River.