Passau (previously Latin: Batavis or Batavia) is a town in Lower Bavaria, Germany. It is also known as the Dreiflüssestadt or "City of Three Rivers," because the Danube is joined at Passau by the Inn from the south and the Ilz from the north.Passau's population is 50,415, of whom about 11,000 are students at the local University of Passau. The university, founded in the late 1970s, is the extension of the Institute for Catholic Studies (Katholisch-Theologische Fakultät) founded in 1622.