Ćorkovac

Ćorkovac is an eastern confluent of the Vrbanja river in Bosnia. It begins on the north-eastern slopes of the Vlašić mountain's plateau, and the mouth opens at Šiprage, where the town's sawmill was. The spring of Ćorkovac is 1,150 metres above sea level, and its length is around 6 kilometres. It flows between the Jasen and Stražbenica mountains to its estuary. The watermills were in operation until the 1960s.
In the relatively narrow area there is a fertile and wide riverhead between Ćorkovac, Ilomska, Čudnić, Kovačevića potok, Grabovička rijeka, Kobilja, Ugrić and other confluents of Vrbanja and the Ugar river.
The crest of the riverhead directs towards the villages of Petrovo Polje, Imljani, Vlatkovići, and the Skender Vakuf Municipality.