The Sea brings together a group of noted contributors to evaluate the different ways in which seas have served as subjects in historiography and asks how this has changed---and will change---the way history is written. The essays in this volume provide exemplary demonstrations of how a sea-based history-writing that focuses on connectivity, networks, and individuals describes the horizons and the potential of thalassography---the study of the world made by individuals imbedded in networks of motion. As Peter Miller contends in his introduction, writing about the sea, today, is a way of partaking in the wider historiographical shift toward microhistory; exchange relations; networks; and, above all, materiality, both literally and figuratively. The Sea focuses not on questions of discipline and professionalisation as much as on the practice of scholarship: the writing, and therefore the planning and organising, of histories of the sea.