西江
Yunnan is the source of two rivers, the Xi River (there known as the Nanpan and Hongshui) and the Yuan River. The Hongshui is a principal source stream of the Xi River. Rising as the Nanpan in eastern Yunnan province, it flows south and east to form part of the boundary between Guizhou province and Guangxi autonomous region. Flowing for , it unites with the Yu River at Guiping to form what eventually becomes the Xi River.