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The report examines seven transboundary river basins—Congo, Okavango, Red, La Plata, Danube, Mekong, and Jordan—to evaluate how ecosystem services (ES) are integrated into Integrated Water Resources Management (IWRM). It finds that while IWRM planning is common, actual implementation is weak and often focuses on traditional services like hydropower and navigation, neglecting critical ES such as carbon sequestration and flood regulation. The authors argue that moving toward an ES-based 'benefit-sharing' model, supported by economic instruments like Payments for Ecosystem Services (PES), can overcome political, institutional, and financial barriers to sustainable transboundary water management.