Danube
Classified as an international waterway, it originates in the town of Donaueschingen, in the Black Forest of Germany, at the confluence of the rivers Brigach and Breg. The Danube then flows southeast for about , passing through four capital cities (Vienna, Bratislava, Budapest and Belgrade) before emptying into the Black Sea via the Danube Delta in Romania and Ukraine.
Donausteig (Danube Trail)
Among the points of interest along the trail are the "Strudengau" with the "Stillensteinklamm", the "Wolfschlucht" near Bad Kreuzen, the Floodplains of the Northern Machland, the "Klamschlucht", the "Pesenbachtal", the "Obere Donautal Oberösterreichs" with the "Schlögener Schlinge", the "Rannatal" and the "Tal des Kleinen Kößlbachs".The "Donausteig" trail runs along the Danube River, starting in Passau and passing through Linz, the former European Capital of Culture, to Grein, an Upper Austrian town with an altitude of 218 meters above sea level, the lowest in the region.