On the basis of the national strategy for the integrated management of the coastline and its regional adaptation by the GIP Littoral Aquitain, the Southern Basque Country Agglomeration wishes to establish its own coastal risk management strategy (erosion and submersion). The impact of the implementation of this strategy will be to preserve not only the security of the population but also the economy of the territory. In addition, this project is fully in line with the sustainable development approach. It will maintain biodiversity and the functions of natural spaces and preserve the environment from further damage; it will also contribute to developing the culture of risk, taking into account climate change.