Subei is the abbreviation of northern Jiangsu Province. At present, there are eight cities: Yangzhou, Taizhou, Nantong, Yancheng, Huai 'an, Suqian, Lianyungang and Xuzhou. Southern Jiangsu is the southern part of Jiangsu Province, including Nanjing, Suzhou, Wuxi, Changzhou and Zhenjiang.

Suzhou, called Wu in ancient times, is called Su for short, and also called Gusu and Pingjiang. It is a national historical and cultural city, a national high-tech industrial base and one of the important central cities in the Yangtze River Delta. Located in the southeast of Jiangsu Province and the middle of the Yangtze River Delta, it is an important part of Jiangsu Yangtze River Economic Belt. It borders Shanghai in the east, Jiaxing in the south, Taihu Lake in the west and the Yangtze River in the north.