Book excerpt: In Following the Proper Channels: Tributaries in the Mekong Legal Regime, Bennett Bearden offers in-depth policy and legal analyses of the marginalization of tributaries in the context of the 1995 Agreement on the Cooperation for the Sustainable Development of the Mekong River Basin, law of international watercourses, hydrosovereignty, and the national economic development interests of the Mekong riparians. As a problem-based study, enlightening conclusions are made based on the increasingly state-centric nature of water resources management in the Mekong region through pursuit of national agendas in the unilateral and bilateral development of tributaries. The overarching legal and hydropolicy issue is whether states can simultaneously pursue hydrosovereignty on tributaries and ensure the Mekong legal regime’s efficacy to achieve holistic water resources management and basin-wide governance.