Marine Sciences and Society Research has demonstrated the value of the world’s great terrestrial parks, from Yellowstone to the Serengeti, in preserving ecosystems, protecting wide-ranging species, and supporting non-extractive industries. Do large ocean reserves offer similar benefits? Overfishing, pollution, climate change, and other human activities are rapidly degrading marine ecosystems. Yet only 0.08 percent of the world’s oceans are protected in "no-take" reserves that prohibit fishing and other extractive activities. By comparison, 5.8 percent of terrestrial habitats are designated as no-take parks. Moreover, most marine reserves are small, inshore protected areas. Only a handful of large, no-take oceanic reserves, such as Papahânaumokuâkea Marine National Monument in the northwest Hawaiian Islands, have been established. Could these large reserves, all protected within the last 6 years, presage an expansion in ocean science and conservation similar to the great terrestrial conservation initiatives of 100 years ago? This session will examine the successes of large terrestrial parks, compare marine and terrestrial reserves of similar scale, and explore conservation benefits of large marine reserves, including increased resilience to climate change. Speakers will discuss what is being learned from existing large, no-take marine reserves and consider ongoing and potential efforts to establish additional large protected areas.