They are: Yucheng District, Mingshan District, Yingjing County, Hanyuan County, Shimian County, tianquan county, Lushan County and Baoxing County.
Ya 'an, also known as Yucheng, belongs to the mountainous area on the western edge of Sichuan Basin, spanning Sichuan Basin and Qinghai-Tibet Plateau, with a subtropical monsoon humid climate, with a total area of 15046 square kilometers.