The area mainly consists of metamorphic rocks and marbles (it is believed that in the past they constituted limestone reefs), while the river bed is composed of sedimentary rocks and alluvial deposits (recent fluvial deposits). In the area lies the large gorge of the River Nestos with steep, rocky slopes as well as riverside vegetation encompassing well formed clusters of trees and groups of Salix alba, S. fragilis, S. amplexicaulis, S. eleagnos, Populus alba, Pinus nigra and a sparse growth (individually) of Platanus orientalis and Alnus glutinosa. From a geological point of view, the area belongs to the mass of Rodopi. The climate ranges between a Mediterranean and continental type of climate.

The area commands particular aesthetic and ecological interest due to its floral diversity, geomorphology and hydrological features. This area is noted for several representative types of natural habitat harboring numerous endemic species either at a local or national level. Emphasis should also be placed on the presence of endemic vertebrates and invertebrates which are presently endangered, although their populations have not yet been accurately estimated. Several of these species have a limited spread.

Area: 500 hectares