Proper noun
(neologism) The part of Russia near northeastern China (including Primorsky Krai and other nearby areas) which was ceded by the Qing dynasty (Manchu) to the Russian Empire in the mid 19th century understood as part of Manchuria. [from 2004]
(literally) Used other than figuratively or idiomatically: see outer, Manchuria (a region of northeast China/Manchuria) [from 19-20th c.]
(figuratively) Any proverbially distant or remote place. [from 20th c.]
Synonyms: Outer Mongolia, Timbuktu
A combination of Soviet military successes and American economic pressure forced the Japanese to withdraw from the area, however, and Outer Manchuria returned to Soviet control by 1925. Source: Internet
Ambiguities in the treaties that ceded Outer Manchuria to Russia led to dispute over the political status of several islands. Source: Internet