 A high degree of karstification of the terrain in the Dinaric Alps has resulted in an increased permeability of soil and rocks and the formation of travertine barriers and waterfalls.The finest examples of the interaction of watercourses and karst are the Plitvice Lakes, listed as a UNESCO World Heritage Site, and Rastoke, to the north of the Plitvice Lakes.Lika and Gorski Kotar are marked by several significant rivers draining north towards the Pannonian Basin.