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The Main is a river in Germany. With a length of 527 km, it is the longest right tributary of the Rhine, and the longest river lying entirely in Germany. The Main is navigable for shipping from its mouth at the Rhine close to Mainz for 396 km to Bamberg. Since 1992, the Main has been connected to the Danube via the Rhine-Main-Danube Canal and the highly regulated Altmühl river.