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,
Danube Swabians that their Shwovish or 'Essekerish' could only be understood by those who also spoke Croatian or Serbian. As is the custom in Hungary (as well as southern Germany), Danube Swabians often put the surname first, especially when writing, for example "Butscher Jakob" (see photo of memorial). Danube Swabian villages tend to have relatively few family names as the villagers stem from only a few families, but usually the same family name does not appear in more than a couple of villages, meaning that there are many Danube Swabian family names. The names come from throughout southern Germany, from assimilated Hungarians,