The Abbay/ Blue Nile River Basin is an essential basin for Ethiopia, the Sudan and Egypt. These riparian states are bound by the same hydrological environment of the shared basin. The use and the demand of water resource in these countries has increased alarmingly from time to time. Furthermore, environmental issues of the basin are highly threatening and demanding an integrated and cooperative approach to halt the problems and ensure sustainable development and utilization of the shared scarce resources of the basin. The traditional national interest oriented unilateralism to shared water resources management, development and utilization is no longer relevant, as the transboundary environmental problems has completely changed the water resources potentials of the basin. This book, therefore, provides a new approach for the sustainable and equitable development, management and utilization of the shared scarce water resources of the Abbay/Blue Nile Basin. In this book: the development potentials, environmental problems, environment and water resource policies of the riparian countries, challenges and opportunities of cooperation in transboundary water management are analyzed.