[1][2] The river is 13 km long and drains parts of the northeastern slopes of the Pirin mountain range.

It initially flows to the northwest, catching the waters of the rest of lake group and the turns in northeastern direction.

[2] The highest waterfall is Banderishki Skok, reaching 11 m at an altitude of 1,700 m. Its surroundings were declared a protected area in 1965.

The Banderitsa then reaches the homonymous mountain refuge and in the next two kilometers runs through rocky and narrow valley.

Upon reaching the meadow Banderishka Polyana on the foothills of the summit of Kutelo (2,908 m), the river disappears underground and reemerges after 1.5 km.