During theQing Dynasty (1644–1912), Hulunbuir was part ofHeilongjiang province. The 1858Treaty of Aigun established today's approximate Sino-Russian border, at a great loss to Heilongjiang's territory. In 1901, theChinese Eastern Railway linked Hulunbuir to the rest ofnortheast China and toRussian Far East. From 1912 to 1949, during theRepublic of China (ROC) period, Hulunbuir was part ofXing'an andHeilongjiang provinces. In winter 1912, the Barga Mongol people of Hulunbuir expelled the Chinese troops and administration and proclaimed the independence of Barga (Hulunbuir); afterwards they declared allegiance to the Bogdo Khan of Mongolia; an agreement between theRussian Empire and the ROC on November 6/October 24, 1915 designated Hulunbuir a "special" region under direct subordination to the Central Government of China, but in practice Russia had partial control over day-to-day administration and economy.[3][4] In 1929, theSoviet Union broke this agreement and invaded Hulunbuir.[5]: 406 After theJapanese invasion of China, Hulunbuir became part of the Japanesepuppet stateManchukuo, which was not recognized by the Chinese. In theChinese Civil War, theChinese Communist Party gained the support of Inner Mongol leaders likeUlanhu by promising theirredentist expansion of Inner Mongolia into areas that had majorities ofHan andManchu peoples.[6]: 90–91
After theChinese Communist Revolution, Hulunbuir was annexed intoInner Mongolia, but the region kept economic ties to the rest ofthe northeast via theChinese Eastern Railway.[7] During theCultural Revolution, the parts of historical Manchuria inside Inner Mongolia were briefly restored to their original provinces; Hulunbuir was given back to Heilongjiang from 1969 to 1979.[7] Until October 10, 2001, Hulunbuir was administered as aLeague. The area is 263,953 km2 (101,913 sq mi) and had a population of 2.710 million in 2004, while thegross domestic product wasRMB 21.326 billion. The jurisdiction area of the city is larger than all but 8 Chineseprovince-level divisions (and 42U.S. states), although the actualurban agglomeration is just a very small part of the region, and the average population density of the area is very low.
Map including part of the Hulunbuir area (AMS, 1955)Mo'erdaoga Forest Park,Ergun
Hulunbuir itself (Hailar) has an extremehumid continental climate (KöppenDwb, TrewarthaDcbd/Dcbc). Winters are long, very dry and severe, due to the semi−permanentSiberian High, while summers are short, though very warm, and rather wet, due to theEast Asian monsoon. At Hailar, the monthly 24-hour average temperature ranges from −25.0 °C (−13.0 °F) in January to 20.9 °C (70 °F) in July, while the annual mean is −0.2 °C (31.6 °F), relatively cold. With at least 58% of possible sunshine in all months and an annual total greater than 2,591.1 hours, sunny weather dominates year-round. Approximately 51% of the annual rainfall occurs in July and August.
Climate data for Hailar District, elevation 650 m (2,130 ft), (1991–2020 normals, extremes 1909-present)
^Кузьмин С.Л. Баргинский и харачинский вопросы в истории Восточной Азии (первая половина XX века). – Т. 1. [Kuzmin S.L. The Barga and Kharachin Questions in the History of East Asia (First Half of the 20th Century)]. – М.: КМК. – 2021. – Т. 1. – 407 p. – ISBN 978-5-907372-78-8 (volume 1)
^Кузьмин С.Л. Баргинский и харачинский вопросы в истории Восточной Азии (первая половина XX века). – [Kuzmin S.L. The Barga and Kharachin Questions in the History of East Asia (First Half of the 20th Century)]. – М.: КМК. – 2022. – Т. 2. – 259 p.+илл. – ISBN 978-5-907372-93-1 (volume 2)
^Bulag, Uradyn E. (2004). "Inner Mongolia". In Rossabi, Morris (ed.).Inner Mongolia: The Dialectics of Colonization and Ethnicity Building. University of Washington Press. pp. 84–116.ISBN978-0-295-98412-4.JSTORj.ctvbtzm7t.7.{{cite book}}:|work= ignored (help)
^abShabad, Theodore (1972).China's Changing Map: National and Regional Development, 1949-71. Taylor & Francis. pp. 237–239.