Only with the constant growth of travertine it is possible to preserve the survival of waterfalls, which are the backbone of the hydrogeological and landscape image and the foundation of the biological diversity of the Krka National Park.
The travertine waterfalls of the Krka River are a natural and karst phenomenon with appropriate values of world scientific interest. With a total flow drop of 224 m, from the source are Bilušića buk (22.4 m), Brljan (15.5 m), Manojlovac (59.6 m), Rošnjak (8.4 m), Miljacka (23, 8 m), Roški slap (25.5 m) and Skradinski buk waterfall (45.7 m). Waterfalls have a very delicate structure and a dynamic purposeful complex sensitive to natural changes and all human activities. Only with the constant growth of travertine it is possible to preserve the survival of waterfalls, which are the backbone of the hydrogeological and landscape image and the foundation of the biological diversity of the Krka National Park.
Bilušića buk is the first of seven cascades along the course of the Krka River. The falls are found wedged in a canyon t an altitude of 214 m above sea level. Near today's riverbed, well-maintained and attractive “dead travertine” can be seen. There are several speleological objects in the travertine barrier of the waterfall, the most important of which is the travertine cave behind the mill.
The waters of the picturesque Ćorić Lake (Brljan Lake) overflow through Brljan. The waterfall is about 300 m long, about 180 m wide, with a drop of 15.5 m. It is surrounded by sub-Mediterranean vegetation and rocky pastures. Due to the needs of HPP Miljacka, specific hydrological conditions of alternating drying and wetting prevail on the travertine barrier.
Manojlovac waterfall is is the largest and is considered by many to be the most beautiful waterfall of the Krka River. The waterfall is made up of a series of travertine barriers with a total height of 59.6 metres; the largest barrier is 32.2 metres high at the place where where the river makes a sharp turn. The canyon surrounding the waterfall is overgrown with sub-Mediterranean vegetation.
The fourth from the spring is the smallest Krka's waterfall Rošnjak, Sondovjel or Šundovil. It is located thirteen and a half kilometers downstream from the source and one kilometre downstream from the Manojlovac waterfall, squeezed between nearly 200 metre tall cliffs. It is made up of one step and due to its primordial simplicity and mystical inaccessibility, the locals called it the Altar.
Miljacka slap is made up of three larger and numerous smaller travertine steps with a total height of 23.8 metres. In the vicinity of the waterfall there are five speleological objects, a spring-caves. The largest among them is Miljacka 2, also the largest speleological object in the area of the Krka National Park Krka.
Roški slap waterfall is the sixth and second to last waterfall on the Krka River. It is found in an expansion of the Krka Canyon, which in its lower course forms a lake-like section of the river, and in the upper course a stretch of cascades, with numerous backwaters and overgrown cascades that the locals have called Ogrlice, the Necklaces, due to the flashes of silvery colour. The travertine barrier is 650 m long, about 450 m wide with a total height of 22.5 m. The main waterfall is found at the end of the barrier, where the Krka crashes in a wide fan-shaped waterfall into Visovac Lake 15 metres below.
Skradinski buk is the last, seventh, longest travertine barrier on the river Krka and in Europe. The combined waters of the Krka and Čikola rivers flow over it. Skradinski buk consists of seventeen barriers spread over 800 m in length. Travertine builders in the upper part of the waterfall, with a network structure of watercourses, lakes and islets overgrown with lush vegetation, still build thresholds and draperies, and in the lower part high barriers with recognizable beards, semi-caves and caves.