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.^[1]

The Trešnjica originates on the southwestern slope of the Povlen, at an altitude of 1,185 m (3,888 ft). The river’s major tributaries are Tribuća (7 km (4.3 mi) long) and Sušica, both from the left. It empties into the Drina near the village of Gornja Trešnjica, at an altitude of 180 m (590 ft).^[2]

Several kilometers before the convergence with the Drina, the river has created a deep limestone gorgelike canyon with vertical cliffs. The canyon was cut into the 800 m (2,600 ft) to 1,000 m (3,300 ft) high plateau. Both major tributaries, Tribuća and Sušica, flow into the Trešnjica in the canyon, which is 6 km (3.7 mi) long. The gorge, deep up to 152 m (499 ft), is almost impenetrable but an attractive location for the climbers.^[2]