Does Zhenjiang belong to southern Jiangsu or northern Jiangsu?

According to my trip to official website, Zhenjiang is located in the southwest of Jiangsu Province, the south bank of the lower reaches of the Yangtze River and the northwest of Taihu Lake Basin. Runzhou in ancient times belongs to the south of the Yangtze River. Zhenjiang, Nanjing, Wuxi, Changzhou, Suzhou and other cities are economically developed, all located in the Yangtze River Delta region. Zhenjiang is a city with a long history and profound cultural heritage. There are many famous scenic spots here, each with its own unique historical and cultural background.