Bosanka (Bosnian women) is a right tributary of the Vrbanja river. It rises on the southern slopes of the mountain Uzlomac (about 800 m above sea level) in four streams. Sources are between Rapno brdo (north) and Matrakova kosa (south). The length is about 6 km. Flowing through Petrovići, and its mouth between the villages of Dabovci and Dudići. The mouth is downstream from Vrbanjci, along highway M-4 (Banja Luka - Doboj). The long history of the name it was Plitka rika, and village nearby to it, in this regard - Plitska (today Vrbanjci).