Bosanska Krupa is a town between Novi Grad (former Bosanski Novi) and Bihać in North-Western Bosnia. It is lying on both shores of the Una river and its main feature is the medieval fortress which is dominating the town.
In underwater caves around Bosanska Krupa, presence of the Olm, a rare, blind cave salamander has been found. Cave-divers have reached depths of over 100m in 2008.