Kučaj mountains
 Kučaj mountains (Serbian Cyrillic: Кучајске планине) is a mountain range in eastern Serbia. Its highest peak Velika Tresta has an elevation of 1284 meters above sea level. They belong to Serbian extension of Carpathians. Kučaj separates the valleys of Great Morava and Timok.The area is a plateau in form of complex tectonic and morphological structure subdivided by the river valleys. Because of the exceptional natural features the region is declared as a nature park.