Upper Rhine"The Upper Rhine is one of four sections of the river (the others being the High Rhine, Middle Rhine and Lower Rhine) between Lake Constance and the North Sea. The countries and states along the Upper Rhine are Switzerland, France (Alsace) and the German states of Baden-Württemberg, Rhineland-Palatinate and Hesse. The largest cities along the river are Basel, Mulhouse, Strasbourg, Karlsruhe, Mannheim, Ludwigshafen and Mainz. The Upper Rhine was straightened between 1817 and 1876 by Johann Gottfried Tulla and made navigable between 1928 and 1977. The Treaty of Versailles allows France to use the Upper Rhine for hydroelectricity in the Grand Canal d´Alsace." - (en.wikipedia.org 21.09.2020) Central Europe Oberrhein (Schweiz)