Introduction to Dulongjiang: As one of the core areas of the "Three Parallel Rivers", Dulongjiang exists independently in addition to the well-known Jinsha River, Lancang River and Nujiang River. It is located in the "Three Parallel Rivers" "The westernmost river is called the "Fourth River". The Dulong River is a first-level tributary of the Irrawaddy River, spanning China and Myanmar, and joins the Irrawaddy River in Myanmar. The Dulong River originates in the southeastern part of the Tibet Autonomous Region, flows through Yunnan Province, and enters Myanmar at the border of Gongshan County.