The Derventski hills are situated between the Tundzha river and the border with Turkey. They are partly covered by broadleaved deciduous forests of Quercus and Carpinus, with Mediterranean trees and shrubs, and there are also open grassy and bushy areas with scattered trees, and arable land. Shrubland is dominated by Paliurus, Jasminum and Nigella. Land-uses are extensive stock-rearing and cultivation, hunting and forestry.
One of the most important breeding sites for Aquila pomarina in Bulgaria. Significant proportion (³1%) of national population breeding at site: Circaetus gallicus (1 pair), Bubo bubo (1 pair), Dendrocopos medius (min. 3 pairs), Hippolais olivetorum (min. 2 pairs).
BirdLife International (2019) Important Bird Areas factsheet: Derventski Heights. Downloaded from http://www.birdlife.org on 25/05/2019.