Lancang River, Nujiang River and Jinsha River. Lancang River, Nujiang River and Jinsha River originate from the Qinghai-Tibet Plateau, flow through Yunnan Province from north to south, and run in parallel in Yunnan Province, so they are called "South Three Rivers". Lancang River is the name of the upper Mekong River in China, which means "Lahu River" in Tibetan. Nujiang River is one of the rivers in southwest China, also known as Lujiang River. The upper reaches are called "Naqu River" in Tibetan, and the Jinsha River is the upper reaches of the Yangtze River in China. The sand in the river is yellow.