[1] The river takes its source under the name Poprashtenska reka at an altitude of 1,043 m at 1.1 km southeast of the summit of Bratan (1,236 m) in the mountain range of Sredna Gora.

It then turns south and enters the Upper Thracian Plain at the town of Brezovo.

The river flows into the Maritsa at an altitude of 131 m at 1.4 km west of the village of Mirovo.

[1] Its drainage basin covers a territory of 237 km2 or 0.45% of the Maritsa's total and borders the drainage basins of the Srebra to the west and southwest, the Omurovska reka to the east and the Tundzha to the north, all of them left tributaries of the Maritsa.

[2] Its waters are utilised for irrigation for the intensive agriculture in the Upper Thracian Plain.