The Li River or Li Jiang is the name for the upper reaches of the Gui River in northeastern Guangxi, China. It is part of the Xijiang River system in the Pearl River basin, flowing 164 kilometres (102 mi) from Xing'an County to Pingle County.

The Xi River or Si-Kiang is the western tributary of the Pearl River in southern China. It is formed by the confluence of the Gui and Xun Rivers in Wuzhou, Guangxi. It originates from the eastern foot of the Maxiong Mountain in Qujing City, Yunnan Province. Then it flows east through Guangdong, and enters the Pearl River Delta just east of the Lingyang Gorge in Zhaoqing. The main branch of the Xi River flows southeast through the delta entering the South China Sea at Modao Men, just west of Macau. The major cities along the Xi include Wuzhou, Zhaoqing, and Jiangmen.