Prekajsko Lake is an artificial lake of Bosnia and Herzegovina on the Unac River. The Unac River rises beneath Šator mountain, flows through the municipality of Drvar and finally meets Una River in Martin Brod. It's dammed to form small Prekajsko Lake and few kilometers downstream larger Župica Lake, before it reach town of Drvar in the municipality of Drvar.
References
Prekajsko Lake Wikipedia(Text) CC BY-SA