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Danube - Wikipedia
Danube River | Map, Cities, Countries, & Facts | Britannica
Danube River - WorldAtlas
The Danube River - World in maps
Danube River: Europe's Longest River (Facts & Info) - Ocean Info
Capital Cities on the Danube River Map | Mappr
Danube – Travel guide at Wikivoyage
Danube River summary | Britannica
How the Danube Became a Multinational Power Source
History and Geography of the Danube River