Чахар
The founding of the People's Republic of China saw several changes: the region around Chengde, previously part of Rehe Province (historically part of Manchuria), and the region around Zhangjiakou, previously part of Chahar Province (historically part of Inner Mongolia), were merged into Hebei, extending its borders northwards beyond the Great Wall. Meanwhile, the city of Puyang was carved away, causing Hebei to lose access to the Yellow River. The city first became part of the short-lived Pingyuan Province, before eventually annexed into Henan. The capital was also moved from Baoding to the upstart city of Shijiazhuang, and, for a short period, to Tianjin.