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The Kaiserstuhl is a very fertile hill in the middle of the Rhine Valley. On the slopes of the former volcano loess was deposited during the Ice Age, making it an ideal region for wine growing. Loess sticks together but doesn't form something like stone. In the old lanes going steep up the vineyards loess was loosened by carriages and washed away by rain over and over again. Located near Bickensohl (part of Vogtsburg) the biggest depth of this sunken lane is 15m. The loess walls are rich biotopes now, giving home to wild bees and other insects as well as many cave breeding birds like f.e Bee-eaters.
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