Oberwinter, a basalt mountain on the left bank of the Rhine opposite Unkel, Germany. A natural amphitheatre with heaps of horizontal basalt columns. After a drawing by Cosimo Alessandro Collini in his Journal d'un Voyage. 1776. Montagne basaltique d'Obervinter sur la rive gauche du Rhin vis-a-vis d'Unckel. Copperplate engraving by Giuseppe Dall'Acqua from Scipion Breislak’s Traite sur la Structure Exterieure du Globe, Treatise on the Exterior Structure of the Globe, Jean-Pierre Giegler, Milan, 1822.

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