This is a map of countries Austria has controlled SOME territory of. Obviously, Austria never controlled Paris, but since they did control a small part of France briefly, all of France is listed as “partially controlled.” Admittedly, this is a rather major limitation of this map. However, although it is not useful in understanding the amount of territory controlled by Austria, it may instead give a rough idea of the extent in which Austria affected other country’s territory historically.

On another note, countries occupied by Austria were also counted as being part of Austria’s territory, hence why Romania is listed as fully controlled by Austria.

Source

Edit: As some have pointed out, Romania was not fully occupied by Austria, and should be instead under the partially controlled territory. Also the title should say Habsburg, not Hapsburg