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Danube - Wikipedia
Danube River | Map, Cities, Countries, & Facts | Britannica
Source of the Danube - Wikipedia
Danube River - WorldAtlas
Danube River: Europe's Longest River (Facts & Info) - Ocean Info
Danube River summary | Britannica
Danube River - Encyclopedia of World Geography
The flow of Danube cooperation: a history of shared responsibility
Countries of the Danube River Basin - ICPDR
Danube River - Hydrology, Tributaries, Basin | Britannica