Gāolígòngshān
The Gaoligong Mountains rise west of the Nu River, forming a steep barrier between the river valley and Tengchong. Several old roads crossed the range. One route over Fenshui Pass was already used in the Yuan period and carried travelers west toward the town. In 1639 the traveler Xu Xiake crossed the Nu and climbed the mountains on his way to Tengchong, recording the difficult landscape he encountered beyond the pass.