外そと蒙もう古こMeaningsNoun1. Outer Mongolia (Historical)Other readings外がい蒙もう古こKanji used外outside蒙ignorance古oldComposed of外そとoutside; exterior; the open (air); other place; somewhere else; outside one's group (family, company, etc.)Noun蒙もう古こMongolia (region); Greater Mongolia; Mongolian PlateauNoun