The Rhine-Main-Danube connection through the ages. Canal cross-sections.
An illustration showing the expansion in size of canals connecting Central European Rivers, pointing also to the size of boats that can pass on the canal. The three stages shown are the Fossa Carolina, ordered by Charlemagne in 793 AD, the Ludwig Canal, named for King Ludwig I of Bavaria, and finally the canal begun in 1921. It was not completed until 1992.
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