An aimag (/ˈaɪmæɡ/ EYE-mag; Mongolian: аймаг [ˈɛe̯mɐ̆q]; Oirat: әәмг [ɛːmə̆q]), originally a Mongolian word meaning 'tribe', is an administrative subdivision in Mongolia, Russia, and in the Inner Mongolia region of China.
Each aimag had an assembly of the local nobility, commonly named "league" in English (chuulga in Mongolian).
Currently, Inner Mongolia has three aimags: Xilin Gol, Hinggan, and Alxa.
During the Qing dynasty, Inner Mongolia was divided into six assemblies of the local nobility (chuulga in Mongolian; 盟 in Chinese).
In some federal subjects of Russia, municipal districts are called aimags: