The walk begins at the Deba beach where we will meet with the Black Flysch. From there we walk up the route of the Talaia Ibilbidea. The name 'talaia' refers to the historic whale spotting sites. We largely follow the coast over the cliffs and we will get to know all the relevant geological elements, such as faults, folds, animal tracks, turbidites... The fascinating landscape shows us coves and capes, waterfalls, landslides, erosion phenomena, different types of streams, etc. and various interesting trees and plants along the cliffs, including salt-tolerant plants.

From a scientific point of view, the most important part is its account of the geohistory. Along the walk we can follow the evolution of the underwater landscape and its ecological conditions, controlled by tectonic conditions. These evolve from a phase of ocean opening to a phase of compression and collision between continents. Apart from that 'long-term' evolution, we will also encounter global events that disrupt life throughout the earth

After this walk you will have a good knowledge of what happened in the ocean during these more than 50 million years.

The route has an accumulated elevation differences of about 600 meters. It is a varied walk through uneven terrain.

Recommended for children with an interest in natural history ages 12 and up.