The port-city interface is under growing pressure, with passenger terminals turning into multifunctional hubs, port authorities taking a more active role in urban development, and rising environmental and social expectations around port governance. This session looks at how legal and institutional frameworks are responding to that pressure in practice. In Tarragona, this means rethinking the legal boundaries of the port’s public domain as passenger services increasingly extend beyond the concession perimeter, requiring port, maritime, and urban planning law to coordinate around a single space. In Dock Sud, it means building a comprehensive port-city governance program around institutional cooperation, community engagement, and a shared strategic agenda for the port and the surrounding territory. In Dunkirk, it takes the form of a data-driven tool mapping industrial water flows across the port zone, turning resource management into a shared governance instrument between port, industry, and local authorities. Together, these cases thus examine how governance frameworks, whether shaped by regulatory necessity or strategic ambition, translate into the daily coordination of port and city.