River knee

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In hydrogeography, a knee (also called a more precise river knee ) describes a curve (mostly due to the landscape) in the course of a river , which topographically resembles a bent knee joint . The direction of the river changes markedly at a very short distance (by at least 90 °) and forms a geographical break in the surrounding landscape, which is a strategically favorable location, e.g. B. for the establishment of cities.

The most famous knees can be found in the Rhine near Basel , Bingen am Rhein , Wiesbaden and Düsseldorf ( Rheinknie ) , with the Basel Rhine knee representing the most striking change in the course of the Rhine.

In the Danube is located in the Hungarian town of Vac , the Danube Bend .

The Volga branches off shortly after  Volgograd towards the Caspian Sea , which is known as the Volga Knee .

In Prague , the section of the river there is often called the Vltava bend , but strictly speaking it is a loop of the Vltava river . A similar situation can be found at the Königstein Fortress (Elbeknie) and in Bern (there, however, called Aare loop ).

Other knees can also be found in the Rhone near Martigny ( Rhoneknie ) , where the river branches off from the Rhone Valley into the Chablais to Lake Geneva , and in the Aare ( Aareknie between Wolfwil and Wynau ).