Almost 3,000 kilometers in length, the Danube is the second longest river in Europe. Because of the varied and attractive landscapes along its banks and the rare animal and plant species found there, the Danube is also known as the queen of rivers. Time and again man has tried to conquer the Danube. It was partially canalized and developed as a modern waterway. But the Upper Danube Valley, the Swabian Donaumoos, the Weltenburg Narrows or the mouth of the Isar could be preserved as natural paradises. Rarities such as the peregrine falcon, the European pond turtle, beaver and the curlew hide in the green wilderness along the blue river. The industrious rodent, which was wiped out almost all of Central Europe more than 100 years ago, only returned to its old homeland in the last few decades - thanks to extensive protective measures. Along the German section - from the springs in the wild and romantic Black Forest down to the Austrian border near Passau, the film journey shows the Danube.