The Upper Thracian Plain (, Gornotrakiyska nizina) constitutes the northern part of the historical region of Thrace. It is located in southern Bulgaria, between Sredna Gora mountains to the north and west, a secondary mountain chain parallel to the main Balkan Mountains; the Rhodopes, Sakar and Strandzha to the south; and the Black Sea to the east.
The Upper Thracian Plain (, Gornotrakiyska nizina) is a part of the historical region of Thrace, situated in southern Bulgaria. It lies north and west of Sredna Gora mountains, a secondary mountain range parallel to the main Balkan Mountains; south of the Rhodopes, Sakar and Strandzha ranges; and east of the Black Sea.