Wupper basin

The Wupper () is a right tributary of the Rhine in the state of North Rhine-Westphalia, Germany. Rising near Marienheide in western Sauerland it runs through the mountainous region of the Bergisches Land and enters the Rhine at Leverkusen, south of Düsseldorf. Its upper course is called Wipper. Both names are related to "weave", and refer to the river's twisting course.