The Mara River Basin Management Initiative (MRBMI) funded by the Norwegian Agency for Development Cooperation (Norad) and WWF-Norway was managed by WWF-ESAPRO from 2003. It was established in response to concerns regarding water resource degradation and depletion in the Mara Basin and impacts on the globally important Mara-Serengeti ecosystem. LTS led the final evaluation of the initiative which drew strategic lessons about the efficacy, impact and the value for money of Norad and WWF-Norway investment in the Mara Basin and evaluated whether intended benefits have been delivered. Specifically, the evaluation focused on assessing the level of genuine empowerment of water users in the Basin, the contributions made to policy and wider learning given the pilot nature of the work, and the contribution to transboundary co-operation. It also established the need for further targeted investment in the basin, and advised on the form this should take. The evaluation provided valuable learning opportunities across WWF and for other organisations supporting communities and institutions to deliver integrated river basin management.