Srbac is a town and municipality in Republika Srpska, Bosnia and Herzegovina. As of 2013, it has a population of 17,587 inhabitants, while the town of Srbac has a population of 2,707 inhabitants.

Derventa is a city in Republika Srpska, Bosnia and Herzegovina. It is situated in the Posavina region, northwest of the city of Doboj. As of 2013, the town has a total of 11,631 inhabitants, while the municipality has 27,404 inhabitants.