Chahar (; ), also known as Chaha'er, Chakhar or Qahar, was a province of the Republic of China in existence from 1912 to 1936, mostly covering territory in what is part of Eastern Inner Mongolia. It was named after the Chahar Mongols.

Administration and history Chahar Province is named after the Chahar, a tribal group of the Mongols who live in that area. The area was controlled (in part or fully) by various empires that ruled over China's north including the Han, Tang, Liao, and Jin dynasties. After the unification of the Mongol tribes under Genghis Khan, the area came under Yuan rule. After the Yuan dynasty (1271–1368), the area was a battleground between the Ming dynasty and Northern Yuan. Then the Chahar tribe became the personal appanage of the monarchs of the Northern Yuan dynasty since the reign of Batumongke Dayan Khan (r. 1479–1517). By the late Qing dynasty (1644–1912), Chahar was the "Zhangyuan Special Region" (), although Yao Xiguang () proposed making Chahar a province as early as 1908.Facsimile reprinted in 1965 in Taipei by Wen-Hai Press

Republic of China era In 1913, the second year of the Republic of China, Chahar Special Administrative Region was created as a subdivision of Zhili Province, containing 6 banners and 11 counties: OCLC 7421313 () () () () () () () () () () ()

In 1928, it became a province. The last five counties on the above list (starting from Xinghe) were partitioned to Suiyuan province. And ten counties were included from Xuanhua Prefecture (宣化府), Koubei Circuit (口北道), Hebei Province: Xuānhuà (宣化) Chìchéng (赤城) Wànquán (萬全) Huáilái (懷來) Yù (蔚) Yángyuán (陽原) Lóngguān (龍關) Yánqìng (延慶) Huái'ān (懷安) Zhuōlù (涿鹿)

All banners belong to the Shilingol League (, 锡林郭勒盟).

From 1937 to 1945, it was occupied by Japan and made a part of Mengjiang, a Japanese-controlled region led by Mongol Prince Demchugdongrub of Shilingol. The Chahar People's Anti-Japanese Army Alliance (察哈爾民眾抗日同盟軍) was established in Kalgan on May 26, 1933 by Feng Yuxiang (馮玉祥) and Ji Hongchang (吉鴻昌).

1948–1952 In 1952, six years after becoming communist, the province was abolished and divided into parts of Inner Mongolia, Beijing Municipality and Hebei. Name Administrative Seat Simplified Chinese Hanyu Pinyin SubdivisionsZhangjiakouZhangjiakouZhāngjiākǒu ShìnoneDatongDatongDàtóng ShìnoneYanbei DivisionDatong CountyYànběi Zhuānqū13 countiesChanan DivisionXuanhua CountyChánán Zhuānqū11 countiesChabei DivisionZhangbei CountyCháběi Zhuānqū9 counties

Geography Chahar Province was divided north-south by the Great Wall, with North Chahar being the larger in area and South Chahar, with the capital, Zhangjiakou, being far larger in population. It had an area of . In North Chahar most of the land was part of the northeastern extension of the Gobi Desert.

Bordered North: Xing'an North and West: Mongolia West and South: Suiyuan South: Shanxi and Hebei East: Rehe and Liaobei

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