Flight Vienna - Amsterdam, morning view across the Danube in S direction. The small town of Grein is shown in the upper right centre of the photo. Uplift of the Bohemian Massif (Waldviertel and Mühlviertel in the foreground, Neustadtler Platte in the background) related to the formation of the Alps has triggered antecedent erosion by the Danube, resulting in the valley section known as Strudengau.