Abstract: Written by a combination of leading practitioners and academics, this book shows that states are more prone to cooperate and manage their transboundary issues over the use of their common water resources through peaceful means, and the key institutions they employ are international river basin organizations (RBOs). Far from being mere technical institutions, RBOs are key mechanisms of water diplomacy with capacity and effectiveness varying on four key interrelated factors: their legal and institutional development, and the influence of their technical and strategic resources.