The Age of Revolutions altered the map of the Indian and Pacific Oceans. More of these oceans were ‘filled in’ in the European mind, as voyages of discovery and scientific studies of oceans, coastlines, and environments proceeded. But the map of these oceans changed in more important ways too. For people of all kinds, the islands of these oceans served as spaces for rethinking politics, forms of association, and social organization. Islands were key locales for the discourses and debates of the Age of Revolutions and their globalization. They became imaginative spaces for considering the past and the future of human society and for deliberating what constituted enlightenment, progress, and varieties of reform. By the middle of the nineteenth century, however, islands in these oceans became sites of counter-revolutionary imperialism. Ultimately, therefore, this chapter illustrates the changing place of islands on the globe and within Britain’s maritime empire.