Khun Nan National Park is part of the Luang Prabang montane rain forestsecoregion.[3]Sapan Waterfall, located near the Lao border, is the most important waterfall in the park; Huai Ha waterfall runs throughout the year. Other waterfalls within the perimeter of the park are Huai Ti and Ban Den. 1,745 m high Doi Phi Pan Nam is the tallest peak within the park. The Wa River has its sources in the mountains of the park and flows through it.[4]