Yizhou Circuit or Yizhou Province was one of the major circuits during the Song dynasty. It was split from Xichuan Circuit in 1001. It was renamed Chengdufu Circuit in 1059.
Its administrative area corresponds to roughly modern central Sichuan.
References
Book: Shi Weile. 2005. Zhongguo Lishi Diming Da Cidian (中国历史地名大词典). Large Dictionary of Chinese Historical Place Names. China Social Sciences Press. 7-5004-4929-1. 2192. zh.
