“Social design” in this project begins with recognising that there are alternative and situated ways of perceiving the sea, particularly, the Tambrau Strait (Indigenous name for Tebrau Strait). It calls for an understanding of the Strait not merely as a border or a frontier for capitalistic speculation, but as a living space inhabited and cared for by the Orang Seletar, who perceive its natural environments in relational continuity with their culture and livelihoods. To design for a living Tambrau Strait, therefore, means to include these fundamental values when designing for their worldviews.