Three Unmissable Stops in Gipuzkoa: The Flysch Route
It's the history of the Earth, written in stone over 60 million years. Zumaia, Deba, Mutriku: three towns on the Gipuzkoa coast that share one of the world's most important geological treasures, recognized as a UNESCO Global Geopark. Sunset over the Itzurun cliffs in Zumaia. (Photo: Jon Larrañaga) What flysch is, and why it's so special Flysch are rock formations created at the same time as mountains, stacked in alternating layers like a giant stone mille-feuille. In the cliffs along this coastline, those layers record 60 million years of geological history — including major events like the mass extinction of the dinosaurs, literally written into the rock. The area is a Protected Biotope and part of Geoparkea, the Basque Coast Geopark, recognized by UNESCO for its geological significance on an international scale. The visible stretch runs about 8 kilometers along the coast, though the formation continues several kilometers further out to sea. The flysch cliffs of Zumaia, G...