The article focuses on the ocean governance systems of the South Atlantic Ocean aiming to contribute to the on-going debate concerning the development of an international legally binding instrument (ilbi) under the un Convention on the Law of the Sea on conservation and sustainable use of marine biodiversity beyond national jurisdiction (bbnj). For this purpose, a broad definition of South Atlantic Ocean has been adopted. The regional treaties and global initiatives relevant for the area are analysed in the context of discussions addressing bbnj. It also evaluated the importance of submissions to the Commission on the Limits of the Continental Shelf concerning the region. The main conclusion is that an ilbi is needed to supplement non-existent or insufficient ocean governance systems in the region and to strengthen and foster the progress of the regional ocean’s governance framework, provided that crucial factors such as transfer of technology and capacity-building are adequately addressed.