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It is next to the "New", regulated Danube. In the past there were regularly floods, so they created around 1870 a new bed for the Danube (in the pic from upper left to bottom right, and the bow-shaped remnant east of it is called "Old Danube".
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Ohhh alright

Hmmm! Are you in Vienna?

No, I didn't think Austria will have a place like that, that was why I asked where it was located..