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How did erosion shape Brittany’s northern coastline?
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Brittany
The old walled city of Saint-Malo, Brittany région, France.
Erosion has played a significant role in shaping the northern coastline of Brittany, resulting in a deeply indented landscape characterized by sharp, carved gorges known as abers.12
These geological features are part of the Armorican Massif, an ancient upland region where mountain-building forces from the Carboniferous Period have been extensively worn down by erosional processes over millions of years. The resulting coastline is highly irregular, reflecting the complex interaction between the region's ancient rock structures and the persistent forces of the sea.21