Where is the "Yunmengze" of Chu State in the Warring States Period now?

Yunmeng Lake, also known as Yunmeng osawa, is the general name of ancient lakes in Jianghan Plain, Hubei Province, China. The south is bounded by the Yangtze River. In the pre-Qin period, the range of this lake group was about 450 kilometers. Later, due to the continuous deposition of sediment brought by the Yangtze River and Hanshui River, the Hanjiang River Delta continued to expand, and the scope of Yunmengze gradually narrowed. It was reduced by half in the Wei, Jin, Southern and Northern Dynasties, and disintegrated into dotted small lakes in the Tang and Song Dynasties. Since then, some small lakes have gradually silted up, while others have expanded. Honghu Lake has rapidly expanded into a big lake since the middle of Qing Dynasty. Today, the ancient lakes in Yunmengze have faded into some separate lakes.

According to Zuo Zhuan, Guoyu and Sima Xiangru's Zixu Fu, there was a State of Chu in the pre-Qin period.

Yunmeng Lake

The hunting area of the king of Chu is called "Yunmeng". Yunmeng has a vast territory, bounded in the east by the foot of Dabie Mountain, Shogun Mountain and even the banks of the Yangtze River east of Wuhan, in the west by Yichang and Yidu, including Songzi and Gongan counties south of the Yangtze River, in the north by Suizhou, Zhongxiang and Jingshan, and in the south by the Yangtze River. There are various geographical forms such as mountains and rivers, and there is a lake called "Yunmengze". "Yunmengze" is named after "Yunmeng", and they do not refer to the same concept. In the Spring and Autumn Period, dream means "Lake Ze" in Chu language, which is related to Sui. Due to the siltation of the Yangtze River, Yunmengze was divided into two parts, and the north of the Yangtze River became a swamp, while the south of the Yangtze River still maintained a vast water surface, called Dongting Lake. Dongting Lake was called Yunmeng in ancient times.