Water is essential for all aspects of life. Managing water is a challenging task, particularly in shared water basins that host more than half of the world’s population. This book explores threats and opportunities through the presentation of case studies that analyse the multi-faceted and dynamic nature of the interplay between domestic and international water security. A range of past, on to going and emerging international water disputes from the Middle East, Africa, Asia and Europe are examined. Well-known cases are revisited from new perspectives while new approaches are suggested as analytical frameworks and practical tools for understanding and coping with emerging security threats.