Socialist Soviet Republic of Abkhazia
The Socialist Soviet Republic of Abkhazia (SSR Abkhazia) was a short-lived Soviet republic within the Caucasus region of the Soviet Union that covered the territory of Abkhazia, and existed from 31 March 1921 to 19 February 1931. The region was previously part of the Georgian Democratic Republic as an autonomy and was formed in the aftermath of the Red Army invasion of the country in 1921.
Source: Wikipedia — Socialist Soviet Republic of Abkhazia (CC BY-SA 4.0)