The document discusses the Magdeburg Water Highway in Germany. It is the world's longest navigable aqueduct at 918 meters. It was constructed from 1997-2003 to connect the Elbe-Havel Canal to the Mittellandkanal without disturbing the natural environment. The two-fold design allows ships to pass safely at different water levels. The water highway has become a popular tourism area, allowing visitors to enjoy the scenic views and use it for recreation like cycling. It has helped reduce pollution from vehicle traffic in the region as well.