The river takes its source from the foot of Midzhur (2,168 m), the highest peak of western Stara Planina, on the Bulgarian-Serbian border, and mainly flows northeast until its upper course, where it heads north.
The description details the geographical origins and flow path of a river, starting from its source at Midzhur mountain on the Bulgarian-Serbian border and outlining its general direction until it reaches its upper course where it turns north.