In the Qing Empire, Chahar was not a province, but a Special Region[?] called Zhangyuan (張垣特區), although Yao Xiguang (姚錫光) proposed making Chahar a province in his "A Humble Suggestion on Planning of Mongolia" (《籌蒙芻議》 chou2 meng2 chu2 yi4).
In 1928, it became a province. The last five counties on the above list (starting from Xinghe) were partitioned to Suiyuan. And 10 counties were included from Xuanhua Subprefecture (宣化府), Koubei Circuit (口北道), Hebei Province:
All banners belong to the Xilinguole Alliance (錫林郭勒盟).
From 1937 to 1945, it was occupied by Japan and made a part of Mengjiang, a Japanese-controlled region led by Prince Demchugdongrub the Xilinguole Alliance. The Chahar People's Anti-Japanese Army Alliance (察哈爾民眾抗日同盟軍) was established in Kalgan in May 26, 1933 by Feng Yuxiang (馮玉祥) and Ji Hongchang (吉鴻昌).
In the middle of North Chahar, there stretches a desert into Mongolia.
Divided by the Great Wall, Chahar has two parts: