Winding through Central Germany, the Main river connects the Rhine with the Danube. The Main-Danube canal, which stretches for a length of 106 miles between Bamberg to Regensburg has an impressive total of 16 locks making it possible to travel via river ship all the way from the North Sea to the Black Sea.
As you would expect from this standard of ship. Nothing too much trouble.
Cruise Line: Silversea
Cruise Ship: Spirit