major areas of north china:shanxi,hebei and northeast china
the main areas of central china:henan and shandong
major regions of northwest china:shaanxi,ningxia,qinghai and gansu
the main areas of east china:anhui and guangxi
the main regions of southwest china:hubei,hunan,jiangxi and sichuan
major areas of beijing-tianjin region:beijing and tianjin
