Lobau
Lobau is part of the national park Donau-Auen, which is immediately east of Vienna. Wikipedia has a short article about it, but the city's own site in German is much better.
Some short points made in the German version:
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The Lobau was originally an island in the Danube.
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The Danube islands were very speices-rich environments, making the islands attractive for hunting.
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When the Danube's flow was regulated Lobau ceased to be an island.
