The main objective of this volume is to demonstrate that the concept of city-sea interface could be intended as a bridging point between coastal planning and maritime management, through a planning downscaling process that could allow the interaction of coastal community demands with ecological-environmental issues within the local and sub-local decision-making frameworks. The innovation of the proposed work lies in the possibility of adaptively supporting the realisation of quality coastal public spaces, in order to enable a real urban ecological transition, through the flexibility of the urban amphibious and the methodological framework that has been tailored to it.