Management of transboundary waters in increasingly becoming more challenging, and climate change is likely to exacerbate these pressures. Not least because climate change is a global issue, adaptation will require an international response. This book aims to identify issues, both theoretical and practical, that States face in establishing cooperative transboundary mechanisms to effectively adapt water management to climate change. Furthermore, it will address complex legal hurdles that existing transboundary water institutions face when attempting to adapt existing mechanisms to function in a changing climate. It will also provide an overview of best practices in transboundary adaptive water governance thus far, in hopes that it can serve as a basis for contributing towards developing a better understanding of the linkages between water and climate change, and what can be done to help institutions and societies to adapt.