- Mae Ngao River is longest and most important river of the park. It is 42 kilometers long and starts at Ban Sob-khong. The river is approximately 10 to 12 meters wide and the water is extremely clear and clean. Many gullies flow into the river and some of them include Huai Mae Loh-noi, Huai Mae-bang, Huai Mae Lela-kro, Huai Oloh-gro, and Huai Kong-oum.
- Mae-yuam River flows from Khun-yuam district and meets Mae Ngao River at Ban Sob-ngao. This river is approximately 215 kilometers long and its flows southwards and passes through the western part of the park for nearly 14 kilometers.
- Rid River is situated in the northern part of the park and flows westwards toward Kong-koi sub district.
The majority of park is evergreen forests which cover land at elevations higher than 1,000 meters. Along the banks of Mae Ngao River you will find mixed deciduous forest. Dry dipterocarps are found growing at the slopes. The park has a large number of mammals, birds, reptiles and amphibians, including including Wild Boars, Asiatic Black Bears, Monkeys, Flying Squirrels, Foxes, Asiatic Wild Dogs, Wild Rabbits, Small Bamboo Rats, Red Jungle Fowls, Singing Myna, Turtle Doves, Blue Magpie, Cobras and Banded Krait.