also: そともうこ
noun
Outer Mongolia
Historical term for the region that roughly corresponds to modern-day Mongolia. Used in pre-20th-century contexts and early 20th-century political discussions.
外蒙古は清朝の支配下にあった。
Outer Mongolia was under the rule of the Qing dynasty.
1911年に外蒙古は独
In 1911, Outer Mongolia declared independence.
From 外 (outside) + 蒙古 (Mongolia), a historical Chinese-derived term distinguishing the northern region from Inner Mongolia.