There are three tributaries in the upper reaches of Sancha River: Rouge River, Zhongdi River and Sujiaji River, which meet in the northeast of Kangle County and are called Sancha River.
Sancha River is one of the tributaries in the upper reaches of Wujiang River, which originates from Weining County at the eastern foot of Wumeng Mountain in western Guizhou and flows from west to east. Dongfeng Reservoir near Shuitouzhai, Qianxi City, Bijie City, Guizhou Province merges with Liuchong River, another tributary, to form Yachi River, and then merges with Qingshui River in Kaiyang County, Guiyang City to form the main stream of Wujiang River.