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Rhine knee
The Rhine knee or Rhine's knee ((ドイツ語:Rheinknie)) is the name of several distinctive bends in the course of the Rhine river.
==Basel==
In Basel, the Rhine changes its westerly direction of flow in an angle of 90 degrees 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 Basel knee separates the High Rhine from the Upper Rhine section.
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.
The Basel knee arose in the last glacial period (Würm glaciation), when the river flowed directly from today's Grenzach-Wyhlen west of the city to the area of Weil am Rhein in the north. The northern Wiese tributary transported large rubble and gravel sediments from the Feldberg glacier into the Rhine Valley, enforcing the river's characteristic bend to the south.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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