Kobilja (Serbian Cyrillic: Кобиља) is a river in Central Bosnia, between Skender Vakuf and Imljani.

The river drains the central part of the northern slopes of the Dinaric mountain massif, with a length of 5 kilometres (3.1 mi).

Band around the top of the extremely rich strong sources of drinking water, of which begin streams basins of Ugar and Vrbanja rivers.

From the Djevojačka ravan (Girls' Plane, above Dunići rocks and Demićka river) to Vakufske Njive (Vaqf Fields) there are over 50 streams.

Watershed of the two basins extends along local roads Skender Vakuf - Turbe - Travnik (via Ilomska, Korićani and Vitovlje).