This text explores some of the ways that climate, hydrology, and water resource management converge at the borders between jurisdictions and countries in the western Hemisphere. It focuses on case studies of climate-hydrology-water resource management in diverse contexts in South, Central, and North America. The book highlights important problems arising from the very existence of boundaries drawn and defined by society. Addressing such problems takes on increasing urgency as the world becomes ever more inter-connected and interdependent. Target groups for this book include water resource managers and decision makers at levels from the international to the local; scientists involved in interdisciplinary studies of basic and applied climatology, hydrology, and environmental studies; and readers specializing in institutional analyses, including transboundary water law, policy analysis, and risk assessment.