General Introduction.- Physical Geography of Abbay Basin.- The Geology of Abbay Basin.- The Geomorphology of Abbay Basin.- Remote sensing for River Basin Management.- Human and Social Geography of Abbay Basin.- Industrial Development and Manufacturing.- Urban Geography of the Basin.- Agriculture.- Sustainable Tourism Development and Management in the Basin.- Soils of Abbay Basin.- Basin Hydrology.- Surface water Hydrology.- Hydrology of Lake Tana Basin.- Groundwater Hydrology.- Forest Resources.- Monitoring and Mapping of Earthquake and Landslides.- Monitoring and Mapping of Flood Risk and Hazard.- Monitoring of Drought Events in the Abbay Basin.- Land Degradation.- Land-Use and Land-Cover Science and Change Analysis.- Contemporary Climate Change Issues in the Abbay Basin.- Features and Hydrology of GERD.- National Development Implications of the Grand Ethiopian Renaissance Dam.- Hydropower Development Agenda.- Irrigation Development Agenda.- Water Resource Management and Development in the 21st century and beyond.- The Geopolitics and Legal Dimension of Ethiopia's Right to Utilize Abbay River.- Integrated Natural Resources Management: needs and efforts.- Integrated Basin Management (IBM).- Soil and Water Conservation and the Green Legacy.- Lessons learned from over 50 years of Watershed Management.- Crop area mapping and Yield Estimation.- Climatological and Hydrological analysis algorithms, tools and techniques.- Tools, Techniques and Algorithms of Retrieving Soil Moisture.- Tools, Techniques and Algorithms of Digital Soil Mapping.- Tools and Techniques of Soil Organic Carbon Dynamics.- Space and time specific fertilizer optimization techniques and tools.- Text mining and analytics to guide decisions in Abbay basin.- Future Research, Planning and Management Directions.