Transcaucasian Socialist Federative Soviet Republic

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

Source: Wikipedia — Transcaucasian Socialist Federative Soviet Republic (CC BY-SA 4.0)