The Pacific of the early eighteenth century was not a single ocean but a vast and varied waterscape, a place of baffling complexity, with 25,000 islands and seemingly endless continental shorelines. But with the voyages of Captain James Cook, global attention turned to the Pacific, and European and American dreams of scientific exploration, trade, and empire grew dramatically. By the time of the California gold rush, the Pacific's many shores were fully integrated into world markets-and world consciousness. The Great Ocean draws on hundreds of documented voyages--some painstakingly recorded by participants, some only known by archeological remains or indigenous memory--as a window into the commercial, cultural, and ecological upheavals following Cook's exploits, focusing in particular on the eastern Pacific in the decades between the 1770s and the 1840s.