Excursion boat in river, Rhine River, Ehrenfels Castle, Bingen, Rheingau, Germany

Fishing boat at harbor, Malta

Boat moored at harbor, Dusseldorf, Germany

Tour boat in river, Castle Katz, River Rhine, Rheingau, St. Goarshausen, Rhineland-Palatinate, Germany

Boats moored at harbor, Ijssel River, Netherlands

Boats in river water, River Limmat, Zurich, Switzerland

Water gushing through rocks, Rhine Falls, Schaffhausen, Switzerland

Container ship in river, Rhine River, Dusseldorf, Germany

Boats in harbor at dusk, Orb River, Herault, France

Aerial view of boats at harbor, Zurich, Switzerland

High angle view of people on boat at harbor, Thames River, Millennium Wheel, Hungerford Bridge, Big Ben, Houses Of Parliament, London, England

Aerial view of castle, Burg Katz, St. Goarshausen, Rhine River, Germany

Boat at harbor, Rhine River, Switzerland