Jehol Province

Rehe (simplified Chinese: 热河; traditional Chinese: 熱河; pinyin: Rèhé; literally: "Hot River"; Mongolian: ᠬᠠᠯᠠᠭᠤᠨ ᠭᠣᠣᠯ), also known as Jehol, is a former Chinese special administrative region and province.

Rehe was located north of the Great Wall, west of Manchuria, and east of Mongolia. The capital of Rehe was the city of Chengde. The second largest city in the province was Chaoyang, followed by Chifeng. The province covered an area of 114,000 square kilometers.

Rehe was once at the core of the Khitan-led Liao Dynasty. Rehe was conquered by the Manchu banners before they took possession of Beijing in 1644. Between 1703 and 1820, the Qing emperors spent almost each summer in their residence of Bishu shanzhuang in Chengde. They governed the empire from Chengde, and received there foreign diplomats and representatives of vassal and tributary countries. The Kangxi emperor restricted the admission to the forests and prairies of Rehe to the court's hunting expeditions and to the maintenance of the imperial cavalry. Agricultural settlements were at first forbidden to Han Chinese. In the early 19th century, by which time Rehe had become part of the province of Zhili, migrants from Hebei and Liaoning settled in Rehe and displaced the Mongol communities.

...
Wikipedia