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,
Battle of the Danube had retreated, the Turks prepared to launch a new attack. Several months later 70,000 Turkish troops led by Ahmet Pasha crossed the Danube river to assault the Russians, encamping across from Ruse, around Slobozia. Well acquainted with his opponent at war, Kutuzov calculated that the Ottomans on the Lower Danube would direct their main force to cross the Middle Danube and to seize Bucharest. Therefore, destroying the fortresses of Silistria Nikopol, Kutuzov took off with his main forces to Ruse and Giurgiu. Zass in Little Wallachia and O'Rourke in Belgrade, covered his right wing, the left guarded by troops, located