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Rangen de Thann - A volcano in Alsace
Tectonic faults and underwater volcanoes, 70 million years at work. They tore open the Upper Rhine Graben, separated the Vosges from the Black Forest, and lowered the Rhine by several kilometres. For thousands of years, Alsace, on the western side of the rift valley, was a conflict line and meeting zone where - like tectonics - currents of Latin and...