Provisional Government of Western Thrace
The Provisional Government of Western Thrace later Independent Government of Western Thrace, was a small, short-lived unrecognized republic established in Western Thrace from August 31 to October 25, 1913. It encompassed the area surrounded by the rivers Maritsa (Evros) in the east, Mesta (Nestos) in the west, the Rhodope Mountains in the north and the Aegean Sea in the south.
Source: Wikipedia — Provisional Government of Western Thrace (CC BY-SA 4.0)