This region characterizes the diversity of its above-ground and underground waters. The source of 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 200 m cliff wall and single-handedly creates Buna River. Unsurprisingly, the Ottoman sultan was impressed, and ordered a tekija (tekka) to be built right next to it. This 16th century house/monastery was built for the Dervish orders and is still one of the mystical places in Bosnia and Herzegovina. It is open to visitors all year round and serves cold drinks, tea and Turkish coffee in a beautiful garden overlooking the source of the river.
The region is also known for the diversity of its flora and a number of endemic species. At lower altitudes there are many evergreen plant and deciduous thicket species, while at higher altitudes in the hills there is sparse forest. Fertile cultivable land is suitable for the agriculture typical of the Mediterranean climate.