Dongting Lake, known as Yunmeng, Jiujiang and Chonghu in ancient times, is located on the south bank of Jingjiang in the middle reaches of the Yangtze River. The name of Dongting Lake began in the Spring and Autumn Period and the Warring States Period. It was named after Dongting Mountain (now Jun Mountain) in the lake. Dongting Lake was once known as "Eight Baili Dongting" in ancient times. In the late 1990s, according to calculations by the water conservancy department, it had an area of ​​2579.2 square kilometers (2740 square kilometers), which is generally called China’s second largest freshwater lake; if the four waters of Hunan, Zi, Yuan, and Li and the "four mouths of the Yangtze River" are added The floodway area of ​​more than 1,300 square kilometers (1,18,780 square kilometers), the two together, is 3879.2 square kilometers (or 4040 square kilometers). The perimeter of the lake basin is 803.2 kilometers, with a total volume of 22 billion cubic meters, of which the volume of natural lakes is 17.8 billion cubic meters and the volume of river channels is 4.2 billion cubic meters. Dongting Lake is an important storage lake in the Yangtze River Basin, with a strong flood storage capacity. It has made countless floods in the Yangtze River ridden, and the Jianghan Plain and the three towns of Wuhan have been able to survive the floods safely. Dongting Lake is an important strategic place in history and the birthplace of Chinese traditional culture. There are many scenic spots in the lake area. The historical sites represented by Yueyang Tower are important tourism and cultural resources. It is also the birthplace of traditional Chinese agriculture, a well-known land of fish and rice, and the most important commodity grain and oil base, aquatic product and breeding base in Hunan Province and even the whole country.