Youshui, also known as Youxi, is one of the five streams in ancient Chugui. It is the largest tributary of Yuanshui River. There are three sources: North, Middle and South. The north source comes from the northwest of Hefeng County, Hubei Province, passes through Laifeng, Longshan and Youyang in the south, turns into Huayuan, Baojing, Yongshun and Guzhang in the east, and flows into Shui Yuan in the south of Yuanling County, with a total length of 477 kilometers. The Central Plains originated in Xiushan and merged with Beiyuan in Liye. After Beiyuan and Zhongyuan meet in Liye, it is called Youshui: Nanyuan originated in Guizhou. After flowing into Hunan, it is called Baihe, now it is also called Garden River, and it flows into Youshui in Baojing.