great usora created by merging gomjenice and brkića stream. small usora springs below (south) of the main road m-4 (banja luka – matuzići, some 10 km west of pribinić). before sastavci locality, right tributary to it are: mišića rijeka, great ostružnja, inova , miljkovača, velika rijeka (great river), brezna and smaller streams, as well as left: rankovića rijeka, and gračanica.