Volume I of The Cambridge History of the Pacific Ocean provides a wide-ranging survey of Pacific history to 1800. It focuses on varied concepts of the Pacific environment and its impact on human history, as well as tracing the early exploration and colonization of the Pacific, the evolution of Indigenous maritime cultures after colonization, and the disruptive arrival of Europeans. Bringing together a diversity of subjects and viewpoints, this volume introduces a broad variety of topics, engaging fully with emerging environmental and political conflicts over Pacific Ocean spaces. These essays emphasize the impact of the deep history of interactions on and across the Pacific to the present day.