The Sesan, Sre Pok and Sekong river basins (3Ss), approximately 78,650 km2, cover parts of
Cambodia, Lao PDR and Viet Nam The sources of the three rivers are in the Central Highlands of Viet
Nam from where the Sekong flows through the Lao PDR before merging with the Sesan and Sre Pok
over a distance of about 40 km before the confluence with the Mekong River at Stung Treng. 3Ss
combined discharge represents about 17% of the annual discharge of the Mekong. Managing these
basins requires innovative arrangements that involve the three countries to ensure sustainable
management of land and water resources and equitable benefit sharing.