Karst phenomena in Bosnia and Herzegovina

The northwestern region of Bosnia and Herzegovina features unique karst phenomena, including the Bobijaško oko and extensive sinkholes in Bosanski Petrovac.

Bobijaško oko, located near Grmeč and Sanski Most, is an estavela—a rare type of karst opening that functions as both a spring and a sinkhole. Depending on water levels, water can either emerge from the underground or drain into the karst system. The area is part of a larger hydrological network connected to the Dabar and Zdene springs and serves as a habitat for the proteus, an endemic subterranean amphibian.

In the Bravsko field near Bosanski Petrovac, hundreds of sinkholes, often referred to as ‘godly karst,’ are located. These funnel-shaped or circular depressions were formed by the dissolution of limestone and dolomite. Some sinkholes reach diameters exceeding 100 meters. These formations provide fertile soil for local agriculture and offer protection from wind. The region is also characterized by significant underground relief, including 17 known caves.