The Mlava River, after a short course through the Krepoljin - Krupaja basin in Vlaško polje, flows into the Gorge of Gornjak. Gornjak gorge begins with an epigenetic valley slightly lower than the confluence of the Krepoljin River into Mlava, and it ends near Ladne vode nearby Ždrelo, Municipality of Petrovac na Mlavi.
The Mlava River cut Gornjak gorge in the Jurassic limestones, and at a length of 16 kilometers through the same gorge, it also formed four clamped meanders. On the left side of the Mlava, the extension of one of the meanders is the location of Gornjak Monastery. A great number of the remains of the Roman fortifications can be found there since the “Via Militaris” road passed through this gorge as well. Gornjak gorge is rich in manifold smaller and unexplored caves, permanent karst springs, and well-preserved forests. Everything previously mentioned is quite approachable to people since the road through the gorge is paved. Not far away from Ladne vode, one can find the remains of the Monastery of the Annunciation, along with the hermitages in the built cave. Gornjak gorge abounds in beautiful landscapes and vivid nature. It is significantly more visited than the Gorge of Ribare due to the regional road that passes through it. Sports fishermen find it quite attractive. With the means of its beauty, cultural sights, and suitable trails for mountaineering climbing, it attracts a great number of visitors and mountaineering enthusiasts.
Natural arches represent natural stone bridges that arise as residues of the collapse of cave ceilings. Most of them cover watercourses in the form of arched limestone vaults. They represent rare forms of karst relief that attract a multitude of tourists.