Rhodope.
The West part of the Rhodope mountain is higher, and the higher peaks, gorges and caves are concentrated in this area. The East Rhodope mountain is characterized by lower relief. The Rhodope mountain lacks the high pinnacle and alpine reliefs which are typical for Rila and Pirin mountains. It is also well known that the mountain had not been frozen during the Ice Age. In the western part of the Rhodope mountain the climate is mountainous, but on the eastern part it is softened by the warm air currents of the Mediterranean, brought by the river valleys.