The rivers springs in mountains Smrčiny in Germany, in altitude of 670 m above sea level. It falls to river Labe (Elbe) near town Ústí nad Labem. The length of river is 302km. The most beautiful park of the river is between Loket nad Ohří and Carlsbad, where the river have made the deep canyon through the mountains Slavkov Forest. Its deep is even 150m.