From the river's source in Germany down to the Black Sea it is about 1.800 miles. The Danube flows through ten countries along this route today. As a cyclist, you will most probably be interested in the Danube's course through Germany, Austria, Slovakia and Hungary.
This bike tour's rightful popularity arises from a great concentration of diverse views, and from tourist sights that bring new variety on each day of a ride. Additionally, one rides upon wide bike paths (or very minor roads) apart from traffic, usually right alongside the river.