Danube-Auen National Park on both land and water, and other invertebrates, the total number of species in Donau-Auen National Park is estimated to be at least 5,000. Danube-Auen National Park Donau-Auen National Park () covers 93 square kilometres in Vienna and Lower Austria and is one of the largest remaining floodplains of the Danube in Middle Europe. The German word Aue (variant Au) means "river island, wetland, floodplain, riparian woodland", i.e. a cultivated landscape in a riparian zone. The words Aue and Au occur in a large number of German place names—including Donau, the German word for the Danube River—and refer to forests,
Army of the Danube Army of the Danube merged in a joint command under André Masséna in April 1799; in June, portions of the Army of the Danube were used to strengthen the Army of the Rhine. Both the Army of the Rhine and the Army of the Danube subsequently merged in 24 November 1799 to form a new, enlarged army designated the Army of the Rhine. Army of the Danube The Army of the Danube () was a field army of the French Directory in the 1799 southwestern campaign in the Upper Danube valley. It was formed on 2 March 1799 by the