Blue Squares: On the Rhine

I am back from vacation including a river cruise in Europe, so I ready to participate in Becky’s Square Challenge for July and the topic is Blue. (I have linked her first day of this challenge, because it is my first day participating and the suggestions she has are in that post.)

Everyone has heard the famous Strauss waltz The Blue Danube. But is the Danube really blue? What about the Rhine?

For my first contribution to this month’s square challenge is a photo I took on board our Viking cruise ship, on the Rhine River somewhere in southern Holland.