Songs have been written about it, and every country it flows through, including Serbia, can boast of having a flowing treasure. If you haven’t guessed yet, it is the Danube. Whether it’s the band Ju grupa singing about it (“Dunave”) or Johann Strauss composing a waltz for it (“The Blue Danube”), summer offers the perfect opportunity to cruise the Danube in Serbia or beyond, and enjoy the unique beauty of this mighty river. International Danube DayTo truly enjoy cruising the Danube, we must also ensure its protection. That is why on June 29th, 14 European countries celebrate Danube Day with a c…