It flows through the Bavarian district of Upper Franconia in Germany, and through the Karlovy Vary and Ústí nad Labem regions in the Czech Republic.
According to one theory, its meaning was 'salmon river' (composed of the words ag, eg – 'salmon', and are, ara – 'flowing water').
[4] The Ohře flows through the Fichtel Mountains in an eastward direction, through Lake Weissenstadt (Weißenstädter See) and through the towns of Röslau and Marktleuthen, and, after almost 50 km, reaches the Czech-German border near Hohenberg an der Eger.
The German part of the river (including the border section) is 49.8 km (30.9 mi) long.
[8] The lower part of the river flows through areas with the lowest average precipitation in the Czech Republic (400–500 mm).