Blagaj Fortress or Old Town of Blagaj, locally known as Stjepan-grad, or Stipan-grad, in classical times Bona, is a town-fortress complex near the town of Blagaj, Bosnia and Herzegovina. Blagaj Fort is 275 metres (902 ft) above sea level. Fortress is National monument of Bosnia and Herzegovina, declared by KONS on 6 December 2003.