noun, noun which may take the genitive case particle 'no'
autonomous region; territory
Refers to a self-governing administrative division, often used for regions like 内モンゴル自治区 (Inner Mongolia Autonomous Region) in China. Can also refer to a territory with some degree of autonomy.
See also: 行政区
内モンゴル自治区は中国の北部にあります。
The Inner Mongolia Autonomous Region is in the northern part of China.
その地域は自治区として認められた。
The area was recognized as an autonomous region.