The Transcaucasian Socialist Federative Soviet Republic (Transcaucasian SFSR or TSFSR), also known as the Transcaucasian Soviet Federative Socialist Republic, was a constituent republic of the Soviet Union that existed from 1922 to 1936. It embraced Armenia, Azerbaijan and Georgia. As they were separated from Russia by the Caucasus Mountains, they were known traditionally as the Transcaucasian Republics.