On 17 January 2026, a new chapter opens for the global ocean. The UN High Seas Treaty, formally known as the Agreement on Biodiversity Beyond National Jurisdiction (BBNJ) under UNCLOS, officially enters into force, transforming years of negotiation into binding international law. For the first time, states have a comprehensive legal framework dedicated to protecting and sustainably using marine life in the vast areas of the ocean that lie beyond national borders.
This moment arrives at a time of acute ecological stress. Overfishing, climate‑driven warming and acidification, plastics and chemical pollution, shipping impacts, and looming deep‑sea mining projects have been eroding the health of high‑seas ecosystems for decades. With the treaty now active, governments finally have tools to create large marine protected areas (MPAs), require environmental impact assessments, share benefits from marine genetic resources, and support developing countries to participate fully in high‑seas governance.
From Negotiation Rooms to a Binding High Seas Treaty
The High Seas Treaty’s path from draft text to binding law has been unusually fast by diplomatic standards. Delegates finalized the text on 4 March 2023 after years of stop‑start negotiations in New York. The agreement was then formally adopted on 19 June 2023, signaling political consensus but not yet creating legal obligations. Ratification by individual countries was needed to turn the text into enforceable international law.
The treaty set a clear entry‑into‑force condition: it would become legally binding 120 days after the 60th ratification. That threshold was crossed in September 2025, when countries including Sri Lanka, St. Vincent and the Grenadines, Sierra Leone, and Morocco deposited their instruments of ratification at the UN. Counting 120 days from that moment yields the landmark date of 17 January 2026, when the treaty finally takes effect.
For a global environmental agreement of this scope, moving from agreed text to legal force in under three years is remarkable. By early 2026, more than 70 states had ratified, reflecting intense diplomatic effort and a broad recognition that business as usual on the high seas is no longer tenable. This speed also underscores how closely the treaty is tied to delivering on global biodiversity and climate goals.
Why the High Seas Needed Their Own Treaty
The United Nations Convention on the Law of the Sea (UNCLOS) has long been called the “constitution for the ocean.” Yet it left a significant gap: there was no dedicated, legally binding regime for conserving marine biodiversity in areas beyond national jurisdiction (ABNJ). These high seas and deep seabed regions make up nearly two‑thirds of the global ocean and more than 40% of the Earth’s surface, but they have been governed by a patchwork of sector‑based rules.
Before the High Seas Treaty, only about 8, 9% of the global ocean fell within any kind of marine protected area, and an estimated 1% or less of high‑seas waters enjoyed full, strict protection. Most international waters remained open to growing pressures, from industrial fishing fleets to shipping corridors and prospective mineral extraction zones. Without a cross‑cutting conservation framework, it was nearly impossible to coordinate measures across sectors or tackle cumulative impacts on ocean ecosystems.
The new agreement directly addresses this governance vacuum. It is the first ever global, legally binding framework specifically focused on conserving and sustainably using marine biodiversity beyond national jurisdiction. By overlaying an ecosystem‑based, biodiversity‑focused regime on top of existing sectoral bodies, it provides a way to identify and protect ecologically important areas, set environmental standards, and coordinate states’ actions across the world’s largest commons.
Four Pillars of a New High Seas Governance System
The High Seas Treaty is built around four core pillars designed to work together as a coherent governance system. The first pillar concerns marine genetic resources (MGRs) and the fair and equitable sharing of benefits arising from their use, including digital sequence information derived from high‑seas organisms. This addresses long‑standing tensions between technology‑rich states and developing countries over access to and profits from genetic materials used in pharmaceuticals, biotechnology, and cosmetics.
The second pillar focuses on area‑based management tools, including marine protected areas. Under the treaty, parties can propose and negotiate large, cross‑sectoral MPAs in international waters, including highly protected and no‑take zones. Once adopted, these MPAs will come with binding rules that can influence fishing, shipping, cable‑laying, and future deep‑sea mining activities, making them far more robust than purely voluntary initiatives.
The third and fourth pillars deal with environmental impact assessments (EIAs) and capacity‑building plus marine technology transfer. States are now obliged to assess planned activities that may have more than a minor impact on the marine environment in ABNJ, and they must cooperate on strategic environmental assessments that consider cumulative impacts. At the same time, parties commit to enhance scientific cooperation, training, data sharing, and the transfer of tools, from ocean observation systems to genetic analysis techniques, so that all states, particularly developing ones, can engage in research, monitoring, and enforcement.
New Power to Create High Seas Marine Protected Areas
One of the treaty’s most transformative features is its power to establish marine protected areas on the high seas. Until now, most large MPAs have been confined to national exclusive economic zones (EEZs), such as the roughly 5‑million‑square‑kilometre MPA declared by French Polynesia in its waters. Extending protection into areas beyond national jurisdiction was more complex, often requiring coordination among multiple regional fisheries bodies and shipping authorities without a unifying legal framework.
With the High Seas Treaty in force, states can collectively propose, negotiate, and adopt MPAs covering vast stretches of international waters. These areas can be designed with a range of protection levels, from multiple‑use zones with strict safeguards to fully no‑take reserves where extractive activities are prohibited. Crucially, the resulting measures are binding on parties and must be implemented through relevant global and regional organizations, aligning fisheries, shipping, and environmental rules with the conservation objectives of each MPA.
This new authority is central to meeting the Kunming, Montreal Global Biodiversity Framework’s “30×30” target: protecting at least 30% of land and sea areas by 2030. Given that high seas and deep seabed regions comprise almost two‑thirds of the global ocean, it will be impossible to achieve 30×30 without creating large‑scale sanctuaries beyond national jurisdiction. The High Seas Treaty finally supplies the legal machinery to identify priority areas, negotiate protections, and lock in conservation measures that endure beyond short‑term political cycles.
Environmental Impact Assessments: Managing Cumulative Stress
High‑seas ecosystems face a convergence of stressors: heavily exploited fish stocks, expanding shipping lanes, chronic noise and plastic pollution, warming waters, acidification, deoxygenation, and the prospect of commercial deep‑sea mining. Many pelagic species, such as sharks, tunas, sea turtles, and whales, depend on these open‑ocean habitats and migrate across multiple jurisdictions, making them particularly vulnerable to poorly regulated activities.
The treaty’s environmental impact assessment provisions aim to confront this problem before new activities are launched. States are now obliged to conduct EIAs for planned actions in areas beyond national jurisdiction that may have more than a minor impact on the marine environment. This includes not only traditional sectors like fishing and shipping, but also emerging industries, from geo‑engineering experiments to bioprospecting expeditions and prospective mining operations.
Beyond project‑by‑project reviews, the treaty encourages states to cooperate on strategic environmental assessments and other tools capable of addressing cumulative and long‑range impacts. By embedding precaution and ecosystem‑based management into decision‑making, the EIA framework can help ensure that development in the high seas does not outpace the science needed to understand its consequences, and that activities are modified, relocated, or halted where significant harm is likely.
Sharing the Benefits of Marine Genetic Resources
Marine genetic resources have long been a source of both scientific excitement and political tension. Organisms living in the deep ocean and on the high seas possess unique adaptations, such as extreme pressure tolerance or novel biochemical pathways, that can inspire new medicines, industrial enzymes, and cosmetic compounds. Until now, most of the benefits from accessing and using these resources have accrued to a small number of technologically advanced countries and corporations.
The High Seas Treaty introduces a system for the fair and equitable sharing of benefits derived from MGRs collected in ABNJ, including digital sequence information. While the details of implementation will be refined over time, the principle is clear: all humanity should share in the advantages of discoveries made in the global commons, not only those with the wealth and technologies to explore them directly. This is particularly significant for developing states that lack research vessels, deep‑sea equipment, or advanced genomic laboratories.
Benefit sharing under the treaty is expected to include both monetary contributions, potentially channeled into a global fund, and non‑monetary measures, such as open data access, joint research projects, and shared training opportunities. In this way, the MGR regime can help align commercial innovation with broader equity and conservation objectives, reducing incentives for unregulated bioprospecting and ensuring that discoveries from the high seas contribute to global public goods.
Capacity‑Building, Technology Transfer, and Global Solidarity
Effective high‑seas governance depends on scientific knowledge, monitoring capacity, and enforcement capabilities that many countries currently lack. Recognizing this reality, the treaty’s fourth pillar focuses on capacity‑building and marine technology transfer, with an explicit emphasis on supporting developing states. Without such support, the benefits of the agreement, and the responsibilities it entails, would remain unevenly distributed.
Parties are now committed to strengthening scientific cooperation, including through training programs, scholarships, joint research cruises, and open access to data and samples collected in ABNJ. Technology transfer may cover a wide range of tools: satellite‑based vessel monitoring systems, autonomous underwater vehicles, genetic sequencing platforms, and ocean observing networks that track temperature, acidity, and biodiversity changes over time.
By creating opportunities for all states to participate in research, monitoring, and decision‑making, the treaty aims to foster a more inclusive and legitimate governance system. This is not only a matter of fairness; it is also a practical necessity. The ocean covers more than 70% of the planet, and no small group of countries can oversee it alone. Building a broad base of capacity and expertise is essential for implementing MPAs, enforcing environmental standards, and adapting management measures as new science emerges.
Diplomacy, Multilateralism, and the Road to COP1
The rapid ratification of the High Seas Treaty reflects years of coalition‑building and civil society advocacy. At the 3rd UN Ocean Conference in Nice in June 2025, a wave of around 18, 19 new ratifications pushed the total close to 50, leaving just 10, 11 more needed. Further commitments at, and around, the UN General Assembly in September 2025 then carried the treaty over the crucial 60‑ratification threshold.
The European Union, Palau, Seychelles, and the broader BBNJ High Ambition Coalition played central roles in coordinating diplomatic outreach, framing the treaty as essential for climate resilience and achieving global biodiversity targets. National commitments also signaled momentum: the UK pledged to ratify by the end of 2025 as part of its marine protection agenda, while large EEZ‑based MPAs like French Polynesia’s highlighted how states were already embracing large‑scale ocean protection within their own waters.
Civil society organizations, including the High Seas Alliance, described the 60th ratification as a “powerful testament to multilateralism… for our ocean, which covers more than 70% of the planet.” UN Secretary‑General António Guterres hailed the treaty’s entry into force as a “lifeline for the ocean and humanity” and a “historic achievement for the ocean and for multilateralism.” Within one year of entry into force, the first Conference of the Parties (COP1) must convene to adopt rules of procedure, financial arrangements, scientific advisory structures, and the initial processes for proposing high‑seas MPAs, decisions that will determine how ambitious and effective this new regime will be.
The High Seas Treaty enters into force at a critical juncture for the planet. With only a fraction of the ocean adequately protected and marine biodiversity in steep decline, the agreement provides a long‑awaited set of tools to manage human activities across nearly two‑thirds of the global ocean. By enabling high‑seas marine protected areas, mandating environmental impact assessments, sharing benefits from genetic resources, and investing in capacity‑building, the treaty addresses both ecological and equity concerns in the world’s largest shared space.
Yet entry into force is only the beginning. Success will depend on how quickly and boldly states use the treaty’s mechanisms, designing robust MPAs, enforcing rules against violators, mobilizing finance, and closing remaining gaps in scientific knowledge. If governments, scientists, industry, and civil society rise to this challenge, the High Seas Treaty can become more than a legal milestone; it can serve as a practical blueprint for safeguarding the blue heart of our planet, helping to stabilize the climate, stem biodiversity loss, and secure a healthier ocean for generations to come.
