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https://en.m.wikipedia.org/wiki/Danube#Cultural_significance
Today, as "Corridor VII" of the European Union, the Danube is an important transport route. Since the opening of the Rhine–Main–Danube Canal, the river connects the Port of Rotterdam and the industrial centres of Western Europe with the Black Sea and, also, through the Danube – Black Sea Canal, with the Port of Constanța.
The waterway is designed for large-scale inland vessels (110 × 11.45 m) but it can carry much larger vessels on most of its course.
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