First, Changzhou:

Jiangsu province is a prefecture-level city, located in the center of Jiangnan and Yangtze River Delta.

Location context:

It is located in the south bank of the lower reaches of the Yangtze River, the water network plain of Taihu Lake Basin, the south of Jiangsu Province, the center of the Yangtze River Delta, the Yangtze River in the north, Taihu Lake in the south and the East China Sea in the east. It is equidistant from Shanghai, Nanjing, Hangzhou and other places, bordering the geographical hub of Jiangnan and connecting with Suzhou and Wuxi. North latitude 3109'-32 04', east longitude119 08'-12012'.

Second, the south:

Refers to the area south of Huaihe River in Qinling Mountains and east of Qinghai-Tibet Plateau, and often refers to the area south of specific or implied azimuth points. In China, "southern region" generally refers to the vast area south of the Qinling-Huaihe line.