While multistakeholder platforms (MSPs) are proliferating in shared waters, there is a diversity of approaches with little comparison or shared learning between them. This CGIAR Initiative on NEXUS Gains webinar reviews experiences in transboundary MSPs, presents a proposed design for a new transboundary MSP in the Incomati Basin, and facilitates discussion on the suitability of that design. The webinar includes a roundtable discussion of notable MSP practitioners, offering relevant lessons for MSP development in other shared watercourses, including the Incomati Basin.