Travertine rock is created by the minerals in the river water. As the water flows over the rock, it leaves behind tiny amounts of calcium carbonate — the same material as chalk and seashells — which slowly builds up into new rock. This means Kravica's waterfall ledge is actually getting a tiny bit bigger every single year, even though you would never notice the difference in your lifetime.
The pool at the base of the falls is a brilliant blue-green colour because the water is very clean and the white travertine rock at the bottom reflects the sunlight. In summer, local families come to swim in the pool, which is refreshingly cool even on the hottest days. Swifts and swallows zoom back and forth catching insects in the spray.
The horseshoe shape of the falls means that if you stand in the right spot, you can see water falling all around you in a wide arc. Ferns, mosses, and wildflowers cling to every damp ledge and crack in the rock, making the whole canyon glow with different shades of green.
The Trebižat is one of the cleanest rivers in Europe, which is why the water at Kravica stays such a beautiful colour. Local people are very proud of this and work hard to keep the river and its banks tidy and unpolluted.