This volume explores how the city and the sea converse and converge in creating new forms of everyday urbanity in archipelagic and island Southeast Asia. Drawing inspiration from case studies spanning Indonesia, the Philippines, Singapore, and New Caledonia, the volume rethinks the place of the sea in coastal cities, through a mobility-inspired understanding of urbanity itself. How might conceptualisations of contemporary coastal urbanisms be approached from the sea, in ways that complicate singularly terrestrial, fixed framings of the city? What connections, contradictions, and dissonances can be found between sea change and urban change? While addressing these questions, the authors re-centre more marginal voices of those who dwell and work in islanded metropoles, offering new insights on the futures and contested nature(s) of littoral urban transformation.