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In page Bamberg:

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Both the Rhine-Main-Danube Canal and its predecessor, the Ludwig Canal, begin near Bamberg.[1] The Ludwig Canal was opened in 1846 but closed in 1950 after damage during the second world war. With the completion of the Rhine-Main-Danube Canal in 1992, uninterrupted water transport was again made possible between the North Sea and the Black Sea.[citation needed]