Manastirskite Vazvisheniya (Monastery Heights) are situated north of Sakar. They comprise territory between Ovcharitza, Sokolitza and Kalnitza rivers. Gradishte is the highest peak (600 m).
Monastery Heights are clearly outlined dome-shaped parts divided from flat col. There are forests on the highest parts of the heights.
Derventskite Vazvisheniya (Derventskite Heights) are situated east from the Tundzha River, on the border between Bulgaria and Turkey. They are very well shaped ridge which is closely connected with Strandzha Mountain. The highest peak is Gyurgenbair (556 m) situated on Bulgarian territory. On the north there are forests and almost naked hills between valleys.
Sakar is a dome-shaped mountain in Southeastern Bulgaria. It is situated between the rivers Maritza, Tundzha, Sokolitza, Sazliyka (Rakitnitza). Above its crest are peaks Vishegrad (865 m), Bogovetz, Bayraka and etc. The mountain has slant southern slopes and steeper northern and eastern slopes. Sakar mountain has been inhabited since ancient times.
