In the Durmitor region a very host of different hydrographical occasions may be met, some of them being natural rarities indeed. At its base are influence of the climate, of the vegetation, of the relief as well as of the tectonic forces acting deep in the inside of our mother earth. Thus, in this parts we meet canyon rivers, lost rivers, karst sources, ice caves, leftover glaciers , glacier lakes in circs, waves and moraine fields. Durmitor lakes, its sources, karst lost rivers are among the most cherished jewels of our mountain. Beside lakes, the sources are the mostly valued water phenomena, the sources being standing or periodic. As standing sources, the most famous are: Ljutica source, Bijela source, and Bajlovica sige in the Tara canyon, and Dubravka source as well as Crno source in the Piva canyon. In the clefts of the Durmitor plateau, in countless ages rivers dug in and made an imposing network of canyons. The wonderful beauty of the Susica canyon is priceless, maybe because not very many looks of tourists were cast on it. On the stroke from the glacier circ right to the Tara canyon entrance, a wonderful landscape was formed, a veritable mosaic of natural phenomena and beauty. The lower, narrow part of the canyon is the break-through of the Susica river with dizzy slopes pine-tree overgrown. As a rare natural phenomenon the Susica river lake is to be mentioned which emerges as a natural barrage forming of the natural flow of the Susica river. In its upper parts the canyon goes on, and forms the most impressive circ – Skrk. At the bottom of the circ, more than eight hundred meters deep, two lakes, The Big Lake, and The Small Lake , are. It is to be mentioned that this lost river, before it flows into the Tara river loses itself quite a few times into the Durmitor. The Susica river is some 14 kilometers long, its source is 1300 meters high, and the confluence with Tara is 512 meters high.
In the great circs of the glacier rivers a number of glacier lakes formed. The Crno jezero (Black Lake) is the most beautiful and the biggest, but actually divided into two surfaces, The Big Black Lake and The Small Black Lake, joined by a place called Struga. The lake is situated bellow the massive Medjed, which is its guardian and protector. The Medjed is covered with dark pine, giving the Crno jezero its blue-green hue. In the Spring when snow melts, on the Medjed emerges a very strong source called Celine, with great roar and white cascades falling into the lake. This natural phenomenon is in the nature of a very strong source on the front of the Malo jezero, and on the foot of the Medjed. As geologist were able to show, Medjed in its bosom has underground lakes which are filled from great rainfalls, and melting of the winter snows. When filled to the brim, these underground lakes overflow and this overflow emerges as a strong source over Malo jezero, the roaring of which may be heard from quite apart. The people call it pukle celine (The celine bursting).
). As a matter of fact, when the waters from the undergound lake start flowing in the direction of the earth surface, they push the air in front of themselves, which makes explosion-like sounds. But here the water does not stop. By mysterious ways under the Durmitor massive, the water also emerges at a place called Dubrovska, confluenting into the Komarnica as Dubrovacka vrela. This sources are very strong, taking quite a quantity of water from the Malo jezero, making its level sink for some ten meters, even more. In dry times, when celina stops, the water from the Big lake flows into the Small lake, but as the loss of water from the Small lake exceeds over the gain of water from the Big lake, the level of the Small lake falls. Geologist found that waters from the Big lake are not lost to the underground flows. When during Celina, when the Small lake gains quite a lot of water, it gives some of it to the Big lake, the Big lake getting its water from some brooks like Mlinski potok. When the whole lake system is filled to the brim, it loses the overflow over a river that ends down of Zabljak, is lost again, and emerges into the Tara canyon from its right side, making the Bijela and Crna vrela.