view over the danube to werenwag castle in autumn, upper danube nature park, swabian alb, germany

danube upper valley river autumn swabian alb baden wuerttemberg werenwag castle germany water donautal nature park oberes natural preserve reserve riverscape landscape waterfront shore banks riverbank rock rocky fall season autumnal colors forest foliage leaves leaf coloration trees october fortress historic fortification building sigmaringen district german southern jura travel destinations europe outdoor daytime