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The river flows from the lower northern part of Torfeno Branishte Nature Reserve on Vitosha Mountain, and passes by Kominite area; at the northern foothills of Vitosha the river crosses the village of Dragalevtsi (now part of Sofia, from which the river takes its name), then join few other minor rivers to form Slatinska River, and flow into Perlovska River which in turn flows into Iskar River in the northeastern outskirst of Sofia.