The old world includes North China, Jiangnan, Guanzhong and other regions.

1. North China: including Beijing, Tianjin, Hebei, Shanxi and other provinces and municipalities.

2. Jiangnan region: including Jiangsu, Zhejiang, Anhui and other provinces, as well as cities such as Shanghai.

3. Guanzhong area: including the central area of ??Shaanxi Province, such as Xi'an, Xianyang and other cities.

4. Other regions: including southwest, northeast, northwest, etc.