The Jialing River, formerly known as Langshui and Yushui, is the largest tributary of the Yangtze River system, named after it flows through the Jialing Valley in the northeast of Fengxian County, Shaanxi Province. The upper source is Bailong River and the Western Han River, and it was called Jialing River until it was below the Lianghekou in Lueyang County, Shaanxi Province, with a total length of 1,119 kilometers and a drainage area of 16, square kilometers, surpassing the Han River, ranking first among the tributaries of the Yangtze River.

According to the Water Classic, "The" Jialing Road "was established in the Han Dynasty, which is equivalent to the present. Including Wudu County, Wudu County leads 9 counties, including Jialing Road, that is, the name of Jialing River comes from the administrative setting, rather than the words in Jiu Yu Zhi, Gansu Xin Tong Zhi and Sichuan Tong Zhi: Jialing River is named because it originated from Jialing Valley in the southwest of Dasanguan. According to Ma Yiyu's Records of Jialing River, Dasanguan is located in the northeast of Dasanling, not. There is no Jialing Valley in the southwest. Another view is that Jialing River is named after Jialing Road, one of the important roads in ancient Guanzhong. According to Huang Shengzhang's article "Historical Development of Sichuan-Shaanxi Traffic", it is inferred from the praise and oblique road and the meridian road that the name "water" comes first and then the name "road". The author thinks that Jialing Road has the same name, that is, Jialing River precedes Jialing Road, and this article thinks: "Jialing Notes on Water Classics: "The water flowing out of Zhoudao Valley is in the south of Gudao County, and there is also Zhoudao in the scattered disk of bronze wares in the Western Zhou Dynasty. According to Wang Guowei's textual research, Zhousan Kingdom is in the area of Sanguan, and Zhoudao is the Zhoudao Valley in Shuijing Note. It can be seen that this road is very ancient, so both the water and Gudao County are named after it. In the early Han Dynasty, this road was called the old road, and now it is called Jialing Road. Jialing River was named diving only during the Warring States Period (475 BC-221 BC). From then on, from the Western Han Dynasty to the Tang Dynasty (26 BC-97 AD), the whole Jialing River from the source Panjiashan to Chaotianmen was called the Western Han River [[al. According to Yuan Hezhi, "Western Han River, a Jialing River", so it was named after the Tang Dynasty, so "Jialing River" A name for Jialing River refers to the section from Lueyang to Chaotianmen. The Unified Records of Qing Jiaqing called Jialing River "smelling water, bashui and yushui", and The Encyclopedia of China, Geography of China, thought that "it was called water between and yushui in ancient times".