Unac River is a river of Bosnia and Herzegovina. It rises beneath Šator mountain, flows through the municipality of Drvar and finally meets the Una River in Martin Brod. Also runs through two deep and rugged krastic canyons and it's dammed to form small Prekajsko Lake and larger Župica Lake, before it reach town of Drvar, in the municipality of Drvar.
Second, Župica Lake, is located a few kilometers downstream and it is a bit larger, and closer to the town of Drvar.
Lower course of the Unac River and its canyon is included into the Una National Park.
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