A couple of bathers enter the flysch of Sopelana beach. The Sopelana flysch are one of the most impressive geological phenomena on the Basque coast. These spectacular cliffs, formed by alternating layers of hard and soft rock that have been deposited over millions of years, tell the story of the planet through their strata. Erosions from the sea and wind have sculpted these unique formations, creating a fascinating landscape that is not only a paradise for geology lovers, but also a stunning backdrop for surfers taking to the waves of Sopelana. Exploring the flysch is like traveling back in time, closely observing the traces of geological evolution and enjoying natural beauty at its finest.