Sredna Gora is a mountain range in central Bulgaria, it is situated in the south of the Balkan mountain range, extending from the Iskar River in the west and the elbow of Tundzha River north of Yambol city to the east. Sredna Gora is 285 km long and reaches 50 km at its greatest width. Its highest peak is Golyam Bogdan at 1'604 m.
The range is divided into three parts by the rivers Topolnitsa and Stryama. The western part is known as Zapadna or Ihtimanska Sredna Gora, the central as Sashtinska Sredna Gora and the eastern part as Sarnena Gora.
Bulgaria 1967, Golyam Bogdan.
The stamp was issued in the series "Mountains of Bulgaria".