The study was conducted on a large part of the Una-Korana Plateau, the largest plateau in the Dinaric karst. ![]() The main purpose of this research was to deepen our understanding of a key stage in the evolution of karst plateaus - the transition from a fluvial landsurface to one dominated by karst surface processes. This study reconstructs the palaeodrainage network of a karst plateau, analyses its properties and establishes its geomorphological significance. It is widely accepted that their development requires a long period of karst denudation. Karst plateaus often have a complex geological and geomorphological history. The aim of this paper is to give the basic theses about the morphogenesis of these caves, particularly in relation to their geomorphological position. Six basic phases of the formation of the speleological objects can be established. These tree caves are parts of one system in sense of speleogenesis. They are the result of the corrosion and erosion caused by the water of the underground part of Grabovac Stream during several phases. Morphological characteristics indicate the dynamics of the formation of the cave system under the influence of the allogenic water. In the south of the dry part of the valley there are two caves: Gornja Barićeva (260 m long) and Donja Barićeva (26 m long). The underground part of the Grabovac Stream flows through its channels. The biggest is Ponor pod Kremenom Cave with total length of the channels of 1019 m. In this area in the period of years 20 a member of Speleological society Karlovac (Karlovac, Croatia) explored three caves. ![]() Partially the Grabovac Stream flows underground. The Grabovac Stream flows from the north to the south through the Grabovac Valley connected to the canyon of the river Korana. This location stipulated the specific condition for the formation of the speleological objects in the south area of Grabovac Valley. The explored area is about 4 km east of Slunj town at the region known as Kordun Karst.
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