To ensure future-proof water management in a warmer world, cross-sectoral, participatory, and adaptive management of water storage, distribution and use are urgently required. A crucial aspect here is the need to shift to cross-sectoral systemic thinking including new management ethics. We, therefore, see a strong need for knowledge-based, participatory decision-making through the development of a new generation of model-based and monitoring-supported information systems and their structured embedment in management structures. OurMED calls for a transition from a mono-sectoral water management approach based on trade-offs, to equitable multi-sectoral and integrative management that addresses all water bodies’ capabilities and needs towards sustainability. OurMED is a PRIMA funded project started in 2023 for a duration of 3 years. Join us in transforming Mediterranean water management for a sustainable future!