Although its waters are not always as blue and clear as in Strauss' Blue Danube, especially when the river is in flood, the Danube's idyllic charm captivates almost every visitor. From majestic Passau to Linz and on to the port of Grein, the river makes its way through opulent countryside, with rich and varied landscapes waiting to be explored. To the joy of its many visitors, this long valley provides numerous opportunities to discover the natural landscapes, history and culture of the region.