A bunch of Eneolithic golden artifacts were found in this country's Varna Necropolis archeological site, while the Golden or Round Basilica in Preslav was built during the reign of its first tsar, Simeon I. The Maritsa River flows through Upper Thrace's largest and this country's second largest city, Plovdiv.
This polity contains the Pirin and most of the Rhodope Mountains, while the Rila range, found in its southwest, contains its highest peak, Mount Musala. A bunch of Eneolithic golden artifacts were found in this country's Varna Necropolis archeological site, while the Golden or Round Basilica in Preslav was built during the reign of its first tsar, Simeon I. The Maritsa River flows through Upper Thrace's largest and this country's second largest city, Plovdiv. The Danube forms most of its northern border with Romania, and its eastern coast is on the Black Sea. For 10 points, identify this southeastern European country with capital at Sofia. 
This polity contains the Pirin and most of the Rhodope Mountains, while the Rila range, found in its southwest, contains its highest peak, Mount Musala.
Republic of {Bulgaria} [accept {Republika Balgariya}]