澧水系湖南省第四大河流,位于该省西北部,流域跨湘鄂两省,地处长江之南;北以武陵山脉北支与湖北清江水系分水;南以武陵山脉南支与沅水分野;西起湘鄂山区,东临洞庭尾闾。地势西、南、北三部较高,东部较低。于流和主要支流皆自西北流向东南,干流偏于流域之南, The fourth largest river in Hunan Province, located in the northwestern part of the province, flows across Hunan, Hubei and Hubei provinces, and is located in the south of the Yangtze River. The northern branch of the Wuling Mountains and the Qingjiang River in Hubei Province are subdivided. In the south, Divided; West Hunan and Hubei mountains, east Dongting tail. Topography West, South and North three higher, the eastern lower. Both the main stream and the main tributaries flow from the northwest to the southeast, and the main stream tends to the south of the river basin.