Prettau is a comune and a village in South Tyrol, a province in northern Italy, located about 80 kilometres northeast of Bolzano at the border …Prettau is a comune and a village in South Tyrol, a province in northern Italy, located about 80 kilometres northeast of Bolzano at the border with Austria. As of 31 December 2015, it had a population of 571 and an area of 86.7 square kilometres. It is the northernmost comune of Italy.