The "Rivers of Karlovac" poster is exclusively available for purchase at the souvenir shop of the freshwater aquarium "Aquatika" in Karlovac – the only freshwater aquarium in the Republic of Croatia and this part of Europe.

Each of the four rivers in Karlovac is beautiful and unique in its own way. Kupa is a rebel that defies the rules, choosing to embark on an adventure towards the Black Sea rather than the nearby Adriatic, only about 30 kilometers away. Korana is a karst beauty with a thousand faces, while Dobra is a shy one that prefers to hide a bit and flow underground. Mrežnica, on the other hand, despite being the shortest, is a magnificent princess that captivates with its waterfalls, travertine cascades, and canyons.