Longchuanjiang River in Tengchong, Baoshan
Longchuan River 腾冲市龙川江is a tributary of the Irrawaddy River within Yunnan Province, part of the Irrawaddy River system. It originates on the western side of Gaoligong Mountain in Tengchong County, Baoshan City, Yunnan Province and the southern border of the Nujiang Lisu Autonomous Prefecture. The river originates at an altitude of about 3400 meters above sea level, with a main stream length of approximately 312 kilometers and a basin area of about 10,820 square kilometers. The river width ranges from 40 to 300 meters, with a natural drop of over 2600 meters. It belongs to the Irrawaddy River system and is a primary tributary on the east bank of the Irrawaddy River. The Longchuan River has an average annual water flow of about 9 billion cubic meters and flows through more than 10 towns including Tengchong County, Longling County, and Luxi City. After merging with the Mangshi River in the southwest of Luxi City, it is called the Ruili River.