also: ないもうこ
Refers to the Inner Mongolia Autonomous Region of China. Both readings are used, but うちもうこ is more common.
Inner Mongolia is an autonomous region located in northern China.
Standard kanji spelling for Inner Mongolia. The reading うちもうこ is the most common Japanese reading.
Alternate reading based on the on'yomi of 内. Less common than うちもうこ but still encountered.
From Chinese 内蒙古 (Nèi Měnggǔ), meaning 'Inner Mongolia'. The Japanese readings are based on the kanji: 内 (uchi/nai) + 蒙古 (Mōko).