Protecting the Salas y Gomez and Nazca Ridges: A review of policy pathways for creating conservation measures in the international waters of the Southeast Pacific

Seamount ecosystems host ecologically important species, including many that are found nowhere else on Earth. The Salas y Gomez and Nazca Ridges, two adjacent seamount chains in the Southeast Pacific, are biodiversity hotspots marked by the highest levels of marine endemism on Earth. Historically isolated from many human activities, this region has produced a unique biodiversity and provides an excellent opportunity for protecting a global biodiversity hotspot before it is degraded. However, no legal protection mechanism currently exists for comprehensively protecting areas beyond national jurisdiction (ABNJ) of the Salas y Gomez and Nazca Ridges. After years of negotiations at the United Nations for a legally binding instrument to address conservation in ABNJ, the Biodiversity Beyond National Jurisdiction (BBNJ) Agreement was finally agreed in March 2023. While this Agreement may provide one avenue for protecting the high seas, the Agreement has yet to be adopted and ratification may take several years. As it stands, conservation efforts in ABNJ will rest on sectoral bodies primarily set to manage large-scale industries like fishing, shipping, and mining, but that do have the ability to enact conservation measures other than restricting these industrial activities. Our study provides an overview of the major international organizations managing activities in the ABNJ of the Salas y Gomez and Nazca Ridges, identifies current conservation measures, and maps out potential policy pathways for creating conservation measures in this unique region. Our synthesis focused on identifying conservation procedures within the documents of international organizations and applying their rules and procedures to implement conservation measures. We identify three potential pathways. A regional and national pathway that relies on cooperation among international organizations spearheaded by the South Pacific Regional Fisheries Management Organization (SPRFMO), and an international pathway through the BBNJ Agreement. •The Salas y Gomez and Nazca Ridges represent an opportunity to protect a global biodiversity hotspot in international waters.•No legal protections exist in the areas beyond national jurisdiction (ABNJ) of these ridges.•Without an overarching legal mechanism, conservation of these ridges rests on multiple decision-making bodies.•Enhancing cooperation among existing structures through cross-sectoral work is crucial for the conservation of ABNJ.•The South Pacific Re