Great Jiangnan is a valley, which means

Great Jiangnan refers to the whole area south of the middle and lower reaches of the Yangtze River, namely southern Jiangsu, Zhejiang, southern Anhui, southwestern Jiangxi, southern Hunan and southern Hubei. Great Jiangnan refers to the whole area south of the middle and lower reaches of the Yangtze River, namely southern Jiangsu, Zhejiang, southern Anhui, southwestern Jiangxi, southern Hunan and southern Hubei. Great Jiangnan refers to the whole area south of the middle and lower reaches of the Yangtze River, namely southern Jiangsu, Zhejiang, southern Anhui, southwestern Jiangxi, southern Hunan and southern Hubei.