The source of the Buna is one of the largest and most beautiful in Europe. It is the finest example of an underground karst river. It flows out of a 200m cliff wall and single-handedly creates the Buna River.

Unsurprisingly, the Ottoman sultan was impressed of the beauty of this place and ordered a tekija to be built right next to it. This 16th century house/monastery was built for the Dervish cults and is still one of the most mystical places in all of Bosnia and Herzegovina.