Most of the mountain consists of a granite batholith surrounded by a metamorphic mantle.
Sakar is a low mountain with flat peaks. From its highest peak, Vishegrad (856 m), in the central part of the mountain, the rounded ridge branches off to the west and east into short, steep ridges separated by deep valleys. The southern slopes are relatively steeper, cut in places by ravines and river valleys. In the eastern parts of the mountain, there are karstified marbles.
It is one of the richest areas in Bulgaria for many birds of prey that are endangered. Sakar is home to 7 of the 12 known nesting sites in Bulgaria for the globally endangered imperial eagle. This makes the mountain an important site for the ecology and conservation of Bulgaria’s flora and fauna.
Sakar is also the heart of Bulgarian megalithic culture—an area rich in dolmens, Thracian sanctuaries, and ancient necropolises that reveal the millennia-old history of these lands.
The mountain is also famous for its wine terroir and grape varieties, which are cultivated on its sun-drenched slopes.
