The Rhine knee (or Rhine's knee, in German Rheinknie) is the name of a few bends in the Rhine river.
In Basel the Rhine changes its westerly direction of flow to a northerly direction, along the borders of France and Germany, to flow to the North Sea. From a political viewpoint the Rhine knee is near the tripoint of France, Germany and Switzerland. Therefore, this region is called Regio TriRhena.
The whole Rhine knee lies within Swiss territory and is settled by the city of Basel and its adjacent municipalities Riehen and Bettingen. Farther north are the German cities of Lörrach and Weil am Rhein as well as the French towns Huningue and Saint Louis.
Another bend in the Rhine is called the Rhine knee, between the German cities of Mainz and Bingen. There is also a bridge in Düsseldorf called "Rhine knee bridge".