Photo de stock - Basalt prism wall, polygonal columns of solidified lava, about 20 million years, Rhön Biosphere Reserve, UNESCO biosphere reserve, Oberelsbach, Bavaria, Germany

Photo de stock: Basalt prism wall, polygonal columns of solidified lava, about 20 million years, Rhön Biosphere Reserve, UNESCO biosphere reserve, Oberelsbach, Bavaria, Germany.

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