Jialing River is a tributary of the upper reaches of the Yangtze River, named after it flows through the Jialing River Valley in the northeast of Fengxian County, Shaanxi Province. (1) The Origin of Water Mirror Annotation 20 (Overflow) says: "The Hanshui River enters Jialing Road in the south and becomes Jialing Water") originated from Daiwang Mountain in Fengxian County, Shaanxi Province at the northern foot of the Qinling Mountains. The main stream flows through Shaanxi, Gansu, Sichuan and Chongqing, and joins the Yangtze River at Chaotianmen in Chongqing. The main tributaries are: Ba Du, Xihanshui, Bailong River, Qujiang River and Fujiang River. With a total length of1.345km, the main stream has a drainage area of 39,200km2, and the drainage area is1.600km2. It is the largest tributary of the Yangtze River, second only to Yalong River in length and second only to Minjiang River in flow.
The Yangtze River originates from the "roof of the world"-the southwest side of Gladden Peak in Tanggula Mountain on the Qinghai-Tibet Plateau. The main stream flows through Qinghai, Xizang Autonomous Region, Sichuan, Yunnan, Chongqing, Hubei, Hunan, Jiangxi, Anhui, Jiangsu, Shanghai * * *1provincial administrative regions (eight provinces, two cities and one district) and flows into the East China Sea east of Chongming Island, with a total length of 6,387 kilometers, making it the second largest in the world after the Nile and the African River.