The Sixaola river basin is shared between Costa Rica and Panama. Since 2011, the BRIDGE project: Building River Dialogue and Governance has worked to promote better cooperation around transboundary waters, implementing a non-conventional approach for hydrodiplomacy. This document summarizes the socioeconomic context of the basin, existing institutional arrangements, interventions by the BRIDGE project and advances of the Binational Commission of the Sixaola River Basin.