Passau is a city in Lower Bavaria, Germany. It is also known as the Dreiflüssestadt, as the river Danube is joined by the Inn from the south and the Ilz from the north. Passau's population is about 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.