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The Danube-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 park was designated a IUCN category II national park and spans the areas of Vienna (Lobau), Groß-Enzersdorf, Orth an der Donau, Eckartsau, Engelhartstetten, Hainburg, Bad Deutsch-Altenburg, Petronell-Carnuntum, Regelsbrunn, Haslau-Maria Ellend, Fischamend and Schwechat.