This book examines sustainability issues of 15 deltas in the world. Each delta is described in five sections: physical setting, socioeconomic characteristics, current issues, management measures and perspective for future pathways to greater sustainability. These deltas, diverse in their geographical and economic conditions, are all confronted with natural hazards and pollution issues, posing threats to ecological health, human security and economic development. The book offers an overview of delta challenges in an integrated natural and social science approach. It is intended for researchers, graduate students and the public, especially those dwelling in deltas. It aims to improve knowledge of the current situation and to enhance awareness of the urgency of collective action to prepare for the uncertain future of these deltas. Possible future pathways towards delta sustainability are also addressed in the book.