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内蒙古东部地区位于北纬41°10′—53°20′,东经115°31′—126°04′。东与黑龙江、吉林、辽宁三省毗邻,西与苏联、蒙古人民共和国、内蒙古锡林郭勒盟交界,南与河北、辽宁二省相连,北以额尔古纳河与苏联接壤。南北长约1,400公里,东西宽处约630公里,中间最窄处约135公里。行政区划,包括三盟一市(呼伦贝尔盟、兴安盟、哲里木盟和赤蜂市)。土地面积约占自治区土地总面积的38.0％左右。人口约占自治区总人
The eastern part of Inner Mongolia is located at 41 ° 10’-53 ° 20’N and 115 ° 31’-126 ° 04’E. East and Heilongjiang, Jilin and Liaoning provinces adjacent to the West with the Soviet Union, the People’s Republic of Mongolia, Xilin Gol League in Inner Mongolia at the junction of the south and Hebei, Liaoning Province, connected to the north bordering the Erguna River and the Soviet Union. About 1,400 km north-south, 630 km east-west width, the narrowest point in the middle of about 135 km. Administrative divisions, including the League of three cities (Hulun Buir League, Xing’an League, Zheli League and the city of Bee). The land area accounts for about 38.0% of the total land area of the autonomous region. The total population of about autonomous region