Panzer Campaigns teaser guessing thread

[ComradeP]

I checked Vienna in the morning as well, using Google maps, but it didn't seem to fit due to the city being spread across both banks (albeit only slightly on the left bank) and the urbanization of the island. I couldn't find an accurate city plan, but did find the wartime damage archive maps.

The first post by phoenix prompted a double take with an actual wartime map.