Hah, a variation of this joke is common in German

Woher kommst du? (Where are you from?)
Australien (Australia)
Na? Wo ist Tralien? (Oh? Where is Tralien?)

The joke being that “aus” means “from” in this context - Australien => Aus Tralien

So Austrians are from Tria?
No, Austria in german is Österreich.