[2] The river takes its source from the Batak Reservoir at an altitude of 1,105 m in the Rhodope Mountains.

[1] In the first 2 km it flows to the north-northeast and then takes a turn in western-northwestern direction in a deep forested valley.

After Kostandovo, the river bed riverbed is corrected with protective dikes.

The river has two main tributaries, both left: the Vrabnitsa and the Rakitovska Stara reka.

[2] The average annual discharge depends on the water outflow from the Batak Reservoir.