The Organisation pour la mise en valeur du fleuve Sénégal (OMVS) and the Autorité du bassin du Niger (ABN) are recognised for their good practices in transboundary cooperation. Both institutions are characterized by robust cooperative frameworks on political and financial dimensions, information exchange, coordination mechanisms and public participation. As highlighted by the following visuals, the proper functioning of these institutions is tributary to multiple factors, but the level of uniformity between the parties seems to be a key facilitator of effective coordination. The illustrations bring a visual insight of the differences between the Senegal and the Niger River Basins' components and contexts.