The Water of the Cities and the Water of the Fields. The Governance of Socio-Ecological Interdependencies -- Ecological Engineering in a Controversial Drinking Water Production Project -- Protecting Against Risks, by the Estuary, and for the Estuary. Living in a City Exposed to Flood Risk -- The Ecological Restoration of Estuaries -- Sensemaking in the Face of Estuarine Flood Risk Mitigation -- When the Estuary Makes the City. The Estuarine City as an Allegory for Changes in Solidarity -- Nantes and the Loire -- Anticipating the Future of Estuarine Cities. Past and Future Socio-Ecological Pathways of the Seine Estuary -- Metropolitan Trajectories for Anticipatory Governance of Urban Biodiversity -- Conclusion.