Integrated water resources management (IWRM) combines land and water management through broad-based stakeholder participation to realize multiple co-benefits in watersheds. IWRM recognizes the economic benefits of managing water and related resources in an integrated manner to provide high levels of ecosystem services (ES). In turn, ecosystem management incorporating ES valuation and management is an increasingly popular and useful means of achieving IWRM goals as well as other socio-economic and environmental benefits. This report provides a review of selected transboundary river basins to ascertain the application of ecosystem-based approaches and to draw specific lessons for effective IWRM in international contexts. Selected basins are those associated with the Mekong, Okavango, Congo, Danube, Jordan, Red and La Plata Rivers and represent Asia-Pacific, Africa, Europe, West Asia, North America and Latin America regions of the world respectively. The analysis focuses on whether basin agencies are recognizing and incorporating bundled ecosystem services into basin management.