The homes and buildings in the historic section of Passau were all beautiful pastel colors and very well cared for. Above you have a fountain which pays tribute to the three rivers that flow through Passau. Every blog and article ever written in history about Passau comments that this is the city of three rivers, Why should I be any different? These three rivers are the Main, Danube and the Ilk. We cruised the Danube and the Main when visiting Bamberg and Passau, Germany.