We continued to return along National Highway 318, accompanied by the Nu River. The Nu River originated in the southern foothills of Jiregepa Peak in the Tangula Mountains in Naqu, the Qinghai-Tibet Plateau, and is the second major river in Tibet. It penetrated deep into the Tibetan Plateau, into Yunnan Province, turned south, into Myanmar, then changed to the Salwen River, and finally injected into the Andaman Sea in the Indian Ocean. From the source of the river to the mouth of the sea, the length of 3,240 kilometers, and the Chinese part of 2013 kilometers, the Nu River became the only river in China that did not build a hydropower station.