Trešnjica is a river in western Serbia. The source of the river is situated on the Povlen mountain. After 23 km the Trešnjica joins the Drina near Ljubovija.

Povlen is a mountain in western Serbia, located thirty kilometers west of Valjevo. It has several peaks, the three most important being Small Povlen, Middle Povlen and Big Povlen, which is, ironically, the lowest.