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Danube River | Map, Cities, Countries, & Facts | Britannica
Danube - Wikipedia
Danube–Black Sea Canal - Wikipedia
Danube Delta - Wikipedia
How the Danube Became a Multinational Power Source
Danube River - WorldAtlas
Danube River: Europe's Longest River (Facts & Info) - Ocean Info
The Danube River - World in maps
Danube River summary | Britannica
Danube River - Hydrology, Tributaries, Basin | Britannica