Introduction to Shanmu River: Shanmu River is the main source of the Li River. It has high mountains and deep valleys, and a large drop in the stream. In the nature reserve, within a short distance of 6 kilometers, the altitude drops from 2000 meters to 500 meters, forming a series of various shapes. The waterfall group, Heigang Waterfall, Jianlong Waterfall, Longjiu Waterfall, and Sandie Feiquan all have a height difference of more than 20 meters. There are high hanging springs and silver waterfalls in the canyon, accompanied by rapids, stone beaches, green pools, and secluded streams with overlapping water. It is known as the "Ten Mile Canyon".