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In the mountainous Upper Danube watershed (77 000 km²) covering parts of Germany and Austria there are in the alpine headwaters 20 big reservoir hydropower plants (annual hydropower generation of more than 250 GWh) and there are 120 relative smaller run-of-the-river stations hydropower plants (annual hydropower generation of 20 to 500 GWh) mainly situated on the river Danube and its larger tributaries Iller, Lech, Isar, Inn and Salzach.

Source: Koch et al. 2011