High angle view of river flowing through field, Danube River, Regensburg, Germany

High angle view of river flowing through valley, Elbe River, Saxony, Germany

High angle view of river flowing through valley, Elbe River, Saxony, Germany

Loop of the Moselle river near Trittenheim, Rhineland-Palatinate, Germany, wide-angle view

High angle view of boats at port, Elbe River, St. Pauli, Hamburg, Germany

High angle view of houses in town at coast, Elbe River, Blankenese, Hamburg, Germany

High angle view of steamboat in river, Danube Gorge, Weltenburg, Kelheim, Bavaria, Germany

Low angle view of castle on hill, Marksburg Castle, Rhine River, Braubach, Nassau, Rhineland-Palatinate, Germany

View to loop of the Moselle river near Traben-Trarbach, Rhineland-Palatinate, Germany, wide-angle view

Aerial view of river flowing through landscape, Piesport, Moselschleife, Moseltal, Moselle River, Rhineland-Palatinate, Germany

High angle view of tourists at market, Rhine River, St. Lambertus Castle, Duesseldorf, North Rhine-Westphalia, Germany

High angle view of cityscape, Bernkastel-Kues, Mosel Valley, Rhineland-Palatinate, Germany

High angle view of a river, Moseltal River, Rhineland Palatinade, Germany