Tešanj is a town and municipality in the northern part of Bosnia and Herzegovina, located near Teslić, Doboj and Zavidovići. One of it’s most prominent features is the Tešanj fort. The foundation of this fortification was started even before the Romans conquered the region. Exact dates are unknown. It was later enhanced by the Romans, Slavs and the Ottoman forces. It has been primarily a defensive fortification. Tešanj Castle is one of the most significant and biggest castles in Bosnia, with the area of some 6,296 square meters.