Sredna Gora is a mountain range in central Bulgaria, situated south of and parallel to the Balkan mountain range and extending from the Iskar River to the west and the elbow of Tundzha north of Yambol to the east. Sredna Gora is 285 km long, reaching 50 km at its greatest width. Its highest peak is Golyam Bogdan at 1,604 m.
The mountain is divided into three parts by the rivers Topolnitsa and Stryama — a western, a central and an eastern part.
The fauna of Sredna Gora is relatively poor compared to other regions of Bulgaria, with typical Central European species being present.
Wikipedia https://en.wikipedia.org/wiki/Sredna_Gora
Coordinates 42°37'30" N 24°26'60" E