During the Spring and Autumn Period, Warring States Period, Qin and Han Dynasties, it generally refers to southern Hubei, including Hunan and Jiangxi.
Modern refers to southern Jiangsu and northern Zhejiang. In addition, there were ten Zhenguan roads in the Tang Dynasty, including Zhejiang, Jiangxi, Fujian, Hunan, the southeast of Danyang, Jiangsu, and Jiangnan, Anhui.
Jiangnan mentioned in the poem refers to the area beautified by literati. Mainly centered on Suzhou and Hangzhou, the Taihu Lake basin in the middle and lower reaches of the Yangtze River is Jiangnan.
The cultural definition of Jiangnan is not limited to the north and south of the Yangtze River, but refers to a kind of water culture centered on Taihu Lake culture in Suzhou, Wuxi and Changzhou, including Yangzhou culture, Huizhou culture and Jinling culture.