Faced with the risk of erosion of rock cliffs in particular on the Basque Corniche, the Basque Country agglomeration Community through the GIS Littoral and scientific partners gathered to build the EZPONDA research project. This project will allow the Basque coast authorities to have new scientific tools that finely measure the processes of alteration of rock cliffs, the retreat of the coastline on areas with specific stakes and the impact of extreme levels on the resistance of coastal defence works (digues, rocks, perrés...) in order to improve actions relating to the prevention of coastal risks and the management of the coastline.