It takes its source from the foothills of Vitosha mountain range, runs through the capital Sofia's South Park, separates the two lanes of Evlogi Georgiev Boulevard, runs through the neighbourhood Poduyane, and finally flows into the river Iskar.

[1] Perlovska springs from the villa zone of Dragalevtsi just south of the capital at an altitude of 820 m, crosses the Sofia Ring Road, connects the new neighborhoods, parallel to Bulgaria Boulevard, and then crosses the South Park.

It flows to the left into the Iskar at 513 m above sea level, 1.2 km northeast of the Obradovski Monastery.

[1] The Geographic Dictionary of Bulgaria and the maps of the Geographic Information System – Sofia accept the Boyanska reka, which takes its source at an altitude of 2,170 m, as part of Perlovaska and as its main stem.

The most famous landmark on the river is the Eagles' Bridge, the starting point of Sofia's largest boulevard, Tsarigradsko shose.