The Wiese is a river, 57.8 kilometres long, and a right-hand tributary of the Rhine in southwest Germany and northwest Switzerland. From its source in Baden-Württemberg in the Southern Black Forest on the mountain of the Feldberg, it flows for a short distance though the county of Breisgau-Hochschwarzwald and then mainly across Lörrach and through numerous settlements including the county town of Lörrach. After crossing the international border, the lower reaches of the river pass through the canton of Basel-Stadt, mainly through the city of Basle and through its district of before emptying into the Upper Rhine.