There are about 50 rivers that run through Slovenia. You may know some of the bigger ones: the Sava, the Drava and the Mura. But what about the little ones? The , for example, goes for 15 kilometers. And the Rinža goes for 9. But the champion is the little Rak river, which runs 2.5 kilometers. And that's its full length. And it's only in Slovenia. But don't let its small size fool you. When the little Rak merges with the Pivka, you get the largest underground confluence of water in Europe. Sometimes things just aren't as small as they may seem.