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Danube River | Map, Cities, Countries, & Facts | Britannica
Danube - Wikipedia
Danube Swabians - Wikipedia
Danube River: Europe's Longest River (Facts & Info) - Ocean Info
A Map of the Danube: From Black Forest to Black Sea
Danube - New World Encyclopedia
Danube – Travel guide at Wikivoyage
Danube River - WorldAtlas
Danube River summary | Britannica
History and Geography of the Danube River