Today the High Seas Treaty, formally the Agreement on the Conservation and Sustainable Use of Marine Biological Diversity of Areas Beyond National Jurisdiction (BBNJ), has officially entered into force, marking a historic milestone for global ocean protection and multilateral cooperation.
Image Credit: Dani Escayola / Ocean Image Bank
Covering nearly half the planet, the High Seas lie beyond national borders and form part of the global commons. The United Nations Treaty establishes, for the first time, a legal framework to protect biodiversity in these international waters and to ensure the benefits of their resources are shared fairly among nations.
“The entry into force of the BBNJ Agreement today stands as a monument to multilateralism and to the years of dedication, dialogue and cooperative action by countless committed people around the world. Global challenges, such as the climate and biodiversity crises, affect all of us. As such, global cooperation is not a choice, it is a necessity. This Treaty embodies hope, resolve, and a shared commitment to a brighter future for the ocean and our planet” said Singapore’s Ambassador for International Law Rena Lee, who served as President of the Treaty negotiations and was pivotal in guiding states to its successful adoption in 2023.
With entry into force, the Treaty now provides the tools to create marine protected areas (MPAs) on the High Seas, set clear obligations on how to ensure ocean resources are used sustainably, capacity building and access to technology and tools is prioritized, and mechanisms are established to ensure fair benefit-sharing. This will play a crucial role in achieving global biodiversity and climate goals, including the target to protect 30 % of the ocean by 2030.
Following two decades of discussions and negotiations, the Treaty text was finalized in March 2023. Sixty country ratifications were required for it to enter into force- a milestone that was reached on 19 September 2025. Today, 120 days later, the Treaty officially becomes international law, and its first Conference of Parties (CoP), the Treaty’s decision-making body, is set to meet within a year.
“The High Seas are full of life- from tiny plankton all the way up to the great whales that rely on them. We’re only just beginning to understand how important this vast, interconnected world is for the health of our entire planet. Whether it’s underwater mountains, deep-sea plains and trenches, the icy polar waters, or the open-ocean highways that migratory species travel, the High Seas are as vital as they are immense. With the High Seas Treaty now coming into force, we finally have the tools to safeguard this extraordinary part of our planet. Protecting it really does mean protecting our future,” said Rebecca Hubbard, Director of the High Seas Alliance.
Several legal obligations apply from today. While some of them are dependent on the set up of the Treaty’s institutions and mechanisms, there are some actionable examples from day one, including any planned activity under a Party’s control that could affect the High Seas or seabed must follow the Treaty’s environmental impact assessment processes, and governments need to publicly notify such activities. Parties must also promote the Treaty’s objectives when participating in other bodies such as those that govern shipping, fisheries and seabed mining.
Ultimately the Treaty’s true power will depend on how it is collectively implemented and upheld in the years ahead. A broader membership will make it more impactful. With 83 parties already on board, momentum is building and more countries are encouraged to join ahead of CoP1.
Meanwhile, the Treaty’s institutional architecture- its bodies and decision-making processes- is currently being shaped through the UN Preparatory Commission, which must deliver strong proposals for adoption at CoP1 so the Treaty can start functioning as soon as possible. Countries are also encouraged to begin identifying important High Seas sites that require protection, so proposals can be brought forward at future CoPs.
“At this halfway point of this critical decade, one of the world’s most ambitious ocean initiatives is entering a new era of systemic change in ocean governance. This reflects a renewed commitment to our ocean, its wildlife, the millions of people that rely on its health, and the global goals set for 2030. The High Seas Treaty shows us that meaningful progress is achieved through vision, perseverance and leadership. As we begin a new year, The Earthshot Prize is committed to backing this landmark Treaty and ensuring it moves beyond words to become a practical and enforceable safeguard for our remarkable blue planet” said Jason Knauf, CEO of The Earthshot Prize.