为管理疆域辽阔的国家,元朝统治者将蒙古国的大断事官制度与金朝的行尚书省制度相结合,创立了最高地方行政机构与行政区划——行中书省制度(简称行省,以下用简称)。大致南抵今长城,西及额尔齐斯河、阿尔泰山,北至西伯利亚之北,东及东北三省西部的地区是元代蒙古族的主要居住区,人称“蒙古地区”。蒙古地区主要属于岭北行省、辽阳行 In order to manage the vast territory of the country, the rulers of the Yuan Dynasty combined the greatness of the Mongolian government with the system of the Shang and Shu of the Jin Dynasty and established the highest local administrative structure and administrative division - , Hereinafter referred to as abbreviation). The area to the west of the Great Wall, the West and the Irtysh River, the Altai Mountains, the north to the north of Siberia, the east of the Three Provinces and the western part of the northeast of China are the main residential areas of Mongolian people in the Yuan Dynasty. They are called the “Mongolia Region.” Mongolia mainly belongs to northern Hebei Province, Liaoyang line