Book excerpt: This book is a multidisciplinary study of the Indian Ocean region, bringing together perspectives from the disciplines of history, defense and strategic studies, cultural and religious studies, and environmental studies. From the earliest exchanges through Sumerian and Harappan trade, to emerging geopolitical alliances in the twenty-first century, this volume demonstrates both the continuity and change of the region as well as its unity and diversity. The expanse of this ocean and its littoral rim is connected through the social imaginary, which enables these processes. It is with the stories of the peoples inhabiting this rim that this book is concerned—told both through micro studies of the everyday lives of the region’s people and through macro studies centered around civilizations, empires, nation-states, and climate change.