Wikipedia
Main-Radweg
The Main-Radweg (English: Main [River] Bike Path) is a major German bicycle path running about 600 km along the Main River in Germany. It starts from either Creußen or Bischofsgrün and ends in Mainz. The General German Bicycle Club (ADFC) rated the trail five stars in 2008, the first path in Germany to receive this award. Approximately 90% of the path is paved and 77% of the route is at least 2.5 meters wide.