Table 1. Seven geographical subareas of Mainland China.

Geographical subarea	Provinces and municipalities
Northeast China	Liaoning, Jilin, and Heilongjiang
North China	Beijing, Tianjin, Hebei, Shanxi and Inner Mongolia
East China	Jiangsu, Zhejiang, Shanghai, Anhui, Fujian, Shandong and Jiangxi
Central China	Hunan, Hubei and Henan
South China	Guangxi, Hainan and Guangdong
Southwest China	Sichuan, Yunnan, Guizhou, Chongqing and Tibet
Northwest China	Gansu, Qinghai, Ningxia, Shaanxi and Xinjiang