Flight Vienna - Amsterdam, morning view across the Danube in S direction to the town of Amstetten (upper centre of the image). The small town of Grein is shown in the lower right centre. Uplift of the Bohemian Massif (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.