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Danube - Wikipedia
Danube River | Map, Cities, Countries, & Facts | Britannica
Danube River: Europe's Longest River (Facts & Info) - Ocean Info
The Danube River - World in maps
A Map of the Danube: From Black Forest to Black Sea
Danube – Travel guide at Wikivoyage
Danube - New World Encyclopedia
Danube River - WorldAtlas
Danube - Simple English Wikipedia, the free encyclopedia
Danube River summary | Britannica