Passau is a town in Lower Bavaria, Germany, also known as the Dreiflüssestadt ("City of Three Rivers") because the Danube is joined there by the Inn from the south and the Ilz from the north.

Passau's population is 50,000, of whom about 12,000 are students at the University of Passau, renowned in Germany for its institutes of economics, law, theology, computer science and cultural studies.

Many river cruises down the Danube start at Passau and there is a cycling path all the way down to Vienna.

More Info: en.wikipedia.org