Brief introduction of unit water

Unitary water, also known as restarting the river. The largest tributary of Yuanjiang, a tributary of the Yangtze River. Originated in Tujia and Miao inhabited areas, the river basin flows through Xuanen (Hubei), Longshan (Hunan), Laifeng (Hubei), Youyang (Chongqing) and Xiushan (Chongqing) from the source, enters Baojing County of Hunan Province in Gao Qiao, and then passes through Yongshun, Guzhang and Yuanling counties, with a total length of 477 kilometers and a drainage area of 18530.