What is the flysch?
The flysch is a curious formation that shows million years of geological history written on successive rocky strata, which were revealed by the continuous action of the sea. The flysch between Deba and Zumaia, besides showing a singular landscape, also offers information on biological, geological, and even climatic changes that have taken place in the last 50 million years. It is a real ‘Tectonic Library’.
Therefore, geologists from all over the world visit this place and it was declared a Protected Biotope by the Basque Government last February. This area covers a land and sea surface of 4,300 hectares and is the sixth biotope in the Basque Autonomous Community.