At Passau, just inside Germany, the Danube (looking remarkably blue), is joined by the River Inn, more milky in appearance. The rivers retain this colour difference for a short distance after their confluence.

The observant readers may just be able to see another tributary near the main confluence,this one being of a darker colour.

The Danube's source is in the Black Forest, the Inn's is Alpine, the town of Innsbruck owing its name to its location on the banks of this river.

Back in early June, Passau was seriously flooded after several days of heavy rain, but it was quite remarkable how quickly the German Authorities had restored things back to normality.