The Plitvice Lower Lakes system is formed in the canyon that is constructed of permeable limestone. The highest rocks in the canyon are about 40 meters. The Plitvice Lower lakes begin with Milanovac Lake , which is connected by the barrier to Kozjak. The traventine cascade formed between Kaluđerovac and Novakovica brod lake is visitors path leading down from the Entrance 1 towards the Big Waterful and then further on around the Lower Lakes upstream in the direction of the Kozjak Lake. Near the very end of Novakovića Brod lake, there are 25 meters high cascades that form Sastavci waterfall.