The Barrika Flysch is a remarkable geological formation located along the coast of Barrika, Bizkaia. Known for its strikingly layered rock formations, it offers a breathtaking glimpse into Earth’s geological history, spanning millions of years.

Formed during the Late Cretaceous and early Paleogene periods, the flysch is a sequence of sedimentary rock layers, alternating between harder limestone and softer claystone. These layers were created by the gradual accumulation of marine sediments, later uplifted and exposed by tectonic activity. Over time, erosion by waves and weather has sculpted the cliffs and shoreline into dramatic, angular patterns that stretch out toward the sea.

The Barrika Flysch is particularly popular among geologists and photographers, as it provides an open “book” of Earth’s geological past. It also holds ecological importance, as the intertidal zones harbor diverse marine life.

Visitors can explore the flysch via coastal walks during low tide, enjoying its raw beauty against the backdrop of the Cantabrian Sea. It is best visited at sunrise or sunset, when the light accentuates its unique formations, making it an essential destination for nature and geology enthusiasts.