In the pre-Qin period, Yunmengze was mainly located in the east of Jingzhou (the second capital of Chu) and between Jianghan and the Yangtze River in the south, which was an impact on the Ludao Delta. It is not difficult to find that this is actually the center of the core area of Chu. "steaming clouds to dream, shaking Yueyang", once 800 years of Jingchu has long since disappeared, but now it is deeply hidden in the memory of Chinese people. It is the spirit that Qu Yuan, a patriotic poet on the Miluo River, merged into Yun Mengze (here, Dongting Lake), and it is an eternal poem that Fan Zhongyan, a scholar in the Song Dynasty, deeply cared for scholars and left behind "Worry about the world first, and enjoy the world later".
By the Qin and Han dynasties, due to the sediment deposition brought by the Hanshui River and the Yangtze River, Jingjiang River and the inland delta of the Hanjiang River were integrated, and Yunmengze was divided into many lakes of different sizes, and some areas even degenerated from lakes to swamps. Yun Mengze, once a "900-mile square", kept shrinking and moving eastward, and the main force was compressed in Huarong County at that time. In the famous Battle of Red Cliffs of the Ming Dynasty at the end of the Eastern Han Dynasty, the defeated Cao Caobing was able to "lead the army back from Huarong Road", but the road was muddy and difficult.
By the time of Zhu (a work in the late Northern Wei Dynasty), the main body of Yunmengze had moved to the east of Huarong County, and Nanyunmengze had been replaced by the newly developed delta plain.
During the Tang and Song Dynasties, the main body of Yunmengze, which gradually became shallow, was mostly filled with silt and became land. According to county records, "summer and autumn flood rise", although "seedlings are like the sea", "spring and summer water is dry, which is a flat field. Zhou Yu is fifteen miles away. " When famous poets Lu You and Fan Chengda Zhou passed by here, Yunmengze, once mysterious and beautiful, was already a place full of lush vegetation and thieves, known as the "Hundred Miles Drought".
Times have changed, and things have changed. Yunmengze, once "900 miles square", has now disappeared in dotted lakes and swamps and scattered between towns. The cloud dream has disappeared, and the palace is full of moss marks; "Li Sao Millennium Fu", written by Wang Sunwei.