Subei, referred to as Subei for short, is located in the Yangtze River Delta with Shanghai as the leader, and is an important part of China coastal economic belt. Northern Jiangsu is dominated by plains, with a vast northern Jiangsu plain, governing rivers and seas, and controlling Huaihe lakes, with prosperous economy and developed transportation. According to the current administrative divisions of Jiangsu, northern Jiangsu includes Xuzhou, Lianyungang, Suqian, Huai 'an and Yancheng.
Sunan, the abbreviation of southern Jiangsu Province, is located in the center of the Yangtze River Delta along the southeast coast of China, bordering Shanghai in the east, Anhui in the west, Zhejiang in the south, the Yangtze River (central and northern Jiangsu) and the East China Sea in the north. It is the most developed area in Jiangsu and one of the most developed and modernized areas in China.
Due to historical reasons, the southern part of Jiangsu, which is close to the most developed city in China and the then capital of old China, has been very developed because of political, economic, cultural, ideological, commercial, transportation and other factors, and it is also the location of Suzhou and Hangzhou, the famous state capital in history, or the surrounding areas. However, northern Jiangsu and southern Jiangsu are separated by a river, and the inconvenient land transportation has always been a bottleneck restricting their economic development. Now, several Yangtze River bridges link southern Jiangsu and northern Jiangsu, which has promoted the economic development of northern Jiangsu. It is certain that the gap between north and south will get smaller and smaller.