Northern Thrace
It forms the northern and largest part of the Thrace region. It is located in Southern Bulgaria and covers the lands south of the Balkan Mountains and east of the Mesta River.
It borders Western Thrace and Eastern Thrace in the south, and the Black Sea in the east. It covers Sredna Gora, the Upper Thracian Plain, and 90% of the Rhodopes.
The climate varies between subtropical, continental transition, and mountainous. The highest temperature recorded in Bulgaria was measured here: 45.2 °C in Sadovo in 1916.
The main rivers of the region are the Maritsa and Tundzha. The area of Northern Thrace is 42,073 km².