The most powerful and by far the longest alpine river at 1,232 kilometers is the Rhine. It rises in the Swiss canton of Grisons, where the Vorder- and Hinterrhein unite. The Rhine forms the border between Switzerland and Liechtenstein and further downstream between Switzerland and Austria before flowing through Lake Constance. The outflow from Lake Constance near Stein am Rhein begins the Upper Rhine, which forms the border between Switzerland in the south and Germany in the north. Beyond Basel, the Upper Rhine becomes navigable and joins the Franco-German border river before it becomes Central and Lower Rhine, crosses the German-Dutch border and finally flows into the North Sea near Rotterdam, around Europe's largest seaport.
In the Julian Alps, in the area around the Triglav in Slovenia, springs the second longest alpine river, the Sava. It is the largest river in Slovenia and Croatia, whose capitals Ljubljana and Zagreb flow through it. Finally, after Bosnia-Herzegovina and Serbia, the Sava flows into the Danube after 945 kilometers in Belgrade.
Another important Danube tributary is the Inn, a particularly diverse river that flows through the Alpine region for about two-thirds of its total length of 517 kilometers. Like the Rhine, it also springs from Grisons, namely in the Engadine. In Passau, the Inn finally flows into the Danube. Originally, the Inn was an important economic route no later than the 12th century. In the 20th century, four Olympic Winter Games took place on its banks between 1928 and 1976 in St. Moritz and Innsbruck, which also owes its name to the river. And still today the Inn is a popular destination for sports enthusiasts, for example for whitewater rafters who find suitable sections for their tours, especially in the upper reaches of the river. In addition to the tourist use of the inn is now economically important especially for power generation. More than 20 of the more than 500 hydroelectric power plants in the Alps use the energy of the Inn. Even if electricity generated from hydropower is considered clean, its use for the environment is often not unproblematic. River courses are changed and straightened. Overall, only about 10% of Alpine rivers are considered naturally flowing ....
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https://marmotamaps.com/de/blog/die-laengsten-fluesse-der-alpen/
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