An arid river valley with rocky massifs, covered by broadleaved forestand dry grassland on the ridges of the hills. Forests are dominated by Quercus, Carpinus and Acer.
The area is one of the most important breeding sites for Tadorna ferruginea and Buteo rufinus in the country. Gyps fulvus and Aquila chrysaetos used to breed in the area many years ago. Significant proportion (³1%) of national population breeding at site: Neophron percnopterus (1 pair), Circaetus gallicus (1 pair), Aquila pomarina (1 pair), Hieraaetus pennatus (1 pair), Bubo bubo (3 pairs).
BirdLife International (2020) Important Bird Areas factsheet: Harsovska Reka. Downloaded from http://www.birdlife.org on 04/04/2020.