Kobilja (Serbian Cyrillic: Кобиља) is a river in Central Bosnia, between Skender Vakuf and Imljani. It is a right bank tributary of the Ugar River. It rises at southeast the slopes of Ježica – Srebrenik masiff, flowing southeast at around 1,010 metres (3,310 ft) above sea level. The river drains the central part of the northern slopes of the Dinaric mountain massif, with a length of 5 kilometres (3.1 mi). Among the many smaller tributaries, the most important right stream is Vukovica, and left are: Strašivi potok, and Zlovarski potok (streams).