From the geographical location of Yancheng, Yancheng does not belong to the south of the Yangtze River in a strict sense. Jiangnan refers to Nanjing, Suzhou, Zhenjiang, Wuxi, Changshu in Jiangsu and Hangzhou in Zhejiang. But compared with the northwest and northeast regions, Yancheng has a better climate. There are only a handful of climate types in Yancheng in the world, which is probably why Cao Wenxuan described Yancheng as Jiangnan.