The Magdeburg Water Bridge (German: Kanalbrücke Magdeburg) – located in Germany, opened in October 2003 and part of the Magdeburg crossing of waterways. It links the Elbe-Havel Canal to the Mittellandkanal, crossing over the Elbe River. It is notable for being the longest navigable channel in the world, having a total length of 918 meters (3,012 ft).
The Elbe–Havel Canal and Mittelland Canal had previously met near Magdeburg but on opposite sides of the Elbe. Ships touching between the two had to make a 12-kilometre (7.5 mi) detour, sinking from the Mittelland Canal through the Rothensee boat lift into the Elbe, and then cruising downstream on the river, before ascending to the Elbe-Havel Canal through Niegripp lock. Low water levels in the Elbe often banned fully laden canal barges from making this crossing, requiring time-consuming off-loading of cargo.