Nanjing, Zhenjiang, Changzhou and so on. According to people of insight, the north and south of the Yangtze River refer to the vast areas near the middle and lower reaches of the Yangtze River, including Nanjing, Zhenjiang, Changzhou, Suzhou, Wuxi, Shanghai, Xuanzhou, Huizhou, Taiping, Ningguo, Hangzhou, Shaoxing, Ningbo, Jiaxing and Huzhou. The book Shang Cao Li Sheng Shi Lang was written by Ji Jing in Qing Dynasty. Letter from Li Sheng to Assistant Minister in Shangcao reflects Ji Jing's deep feelings and care for the north and south of the great river, and also shows his unique views and thoughts on history, culture, natural landscape and human civilization.