Since the end of the Cold War, the international order has undergone profound transformations that have redefined not only the power distribution but also the nature of bonds between governance actors. In some regions, however, the development of such solutions has lagged far being the surge in new security- and development-related issues. Over the past decade, we can observe renewed regional efforts designed to boost cooperation on security and development issues around the South Atlantic. The Zone of Peace and Cooperation in the South Atlantic (ZOPACAS), is undergoing a revitalization and readaptation within a radically changed context. This book seeks to explore the dynamics of institutional resilience within a regional context―what drives the process of revitalization, and what are its consequences for regional security and development?―by examining continuity and change in the revitalization of ZOPACAS. The authors evaluate the actual potential of ZOPACAS as an effective transregional governance platform and grasp its contribution to the current debate on Global South-based institutions. Proposing a new conceptual framework to understand regionalism dynamics and connecting debates that tend to be carried out in isolation including maritime security, interregionalism, South-South relations and global studies this work will be of interest to students and scholars alike.