Rtanj is a mountain situated in Eastern Serbia, approximately 200 km southeast of Belgrade, between towns of Boljevac on north and Sokobanja on south. It belongs to the Serbian Carpathians. Its highest peak is Šiljak (1,565 m), a natural phenomenon of karst terrain.The north side of the mountain is covered with forests and shrubs, full of autochthonous plant species and plenty of sources of potable water. A hunting ground covers 6368 ha. The most common prey are roe deer and wild boar.