The Moselle is a river flowing through France, Luxembourg, and Germany. It is a left tributary of the Rhine, joining the Rhine at Koblenz. A small part of Belgium is also drained by the Moselle through the Sauer and the Our.Cruises on the Mosel River are often combined with Rhine River cruises. This is a great way to experience some of Europe’s oldest and most enchanting cities in Germany, Luxembourg and France.