Philippines Pushes South China Sea Seabed Claim as China Objects and ASEAN Talks Continue

A Claim Beyond 200 Nautical Miles

The Philippines presented a partial submission to the United Nations Commission on the Limits of the Continental Shelf on July 28, seeking recognition of seabed and subsoil rights beyond its standard exclusive economic zone of 200 nautical miles off western Palawan. The filing follows fifteen years of surveys and brings a new legal step into the South China Sea dispute.

China has urged the commission not to consider the submission, accusing Manila of infringing on Chinese sovereignty and jurisdiction. Malaysia has also objected, citing overlapping maritime entitlements. The Philippine government says its action follows the United Nations Convention on the Law of the Sea and leaves sovereignty disputes and future boundary negotiations open.

The submission comes as the Philippines chairs the Association of Southeast Asian Nations, or ASEAN, and seeks progress on a code of conduct with China. Foreign ministers have expressed hope that negotiations can conclude by December 2026, while confrontations involving vessels continue near Scarborough Shoal and Second Thomas Shoal.

The legal process concerns rights to the seabed and the ground beneath it. It does not extend Philippine sovereignty over the sea surface or give Manila additional rights over the water above the claimed shelf. Understanding that scope helps explain why a technical submission can proceed alongside separate disputes over territory, maritime boundaries and conduct at sea.

What Manila Wants the Commission to Review

Philippine officials describe the submission as the result of fifteen years of surveys and an effort to secure resources for future generations. Those surveys underpin the scientific and technical case that the commission will examine before issuing recommendations on the extended continental shelf.

Assistant Secretary Rogelio Villanueva Jr said the filing demonstrates the country's commitment to the United Nations Charter and the 1982 United Nations Convention on the Law of the Sea. The convention provides the legal framework cited by Manila for seeking recognition of continental shelf rights beyond 200 nautical miles.

The Department of Foreign Affairs said the action supports an international order governed by rules, linking that approach to sustaining livelihoods, supporting trade, protecting marine biodiversity and bringing coastal states together. Philippine representatives at the United Nations also described the submission as a way to renew commitment to established maritime processes.

How Extended Continental Shelf Rights Work

Article 76 of the convention allows coastal states to claim an extended continental shelf reaching up to 350 nautical miles in some cases. The right concerns the seabed and subsoil, meaning the sea floor and the ground underneath it, rather than the entire stretch of sea above.

The exclusive economic zone and the extended continental shelf therefore have different scopes. Manila's filing seeks rights beyond the standard zone of 200 nautical miles, but only for the seabed and subsoil covered by the submission. Surface sovereignty and rights over the water column are outside that claim.

The United Nations Commission on the Limits of the Continental Shelf reviews scientific and technical information before making recommendations. Its examination addresses the basis for the proposed shelf limits. Where claims overlap with those of neighboring states, the countries must deal with their boundaries through separate talks.

Philippine officials say the submission is without prejudice to ongoing sovereignty disputes or future negotiations. In plain terms, Manila is pursuing its shelf claim while leaving those other issues open for their own legal and diplomatic processes.

Overlapping Claims Keep Boundary Talks in View

The area covered by the Philippine submission includes deeper seabed around Pagasa Island and overlaps zones held by several other nations. Those overlaps make negotiations with neighboring claimants part of the wider task, even as the commission considers the scientific case.

Malaysia's objection centers on overlapping maritime entitlements. China has taken a broader position, accusing the Philippines of flagrantly infringing on its sovereignty and jurisdiction and asking the commission not to review the filing.

Philippine representatives at the United Nations have expressed readiness to discuss overlaps with neighboring countries through established channels. Their position pairs the technical submission with a commitment to boundary discussions, rather than presenting the commission's review as the final step in resolving competing claims.

No timetable was given for the commission's recommendations or for boundary talks. December is the target discussed for the separate ASEAN code of conduct negotiations, which address behavior in the disputed waterway.

China Challenges Manila's Use of the 2016 Ruling

Beijing also rejected any attempt to refer to the 2016 arbitration ruling that invalidated its nine dash line claims. China continues to call the award illegal and described the Philippine submission as a pretext to promote it.

The disagreement over that ruling remains central to the positions of both governments. Philippine President Ferdinand Marcos Jr reaffirmed in his state of the nation address that the country would uphold the 2016 ruling and would not yield in defending its rights.

China has made similar protests against extended continental shelf submissions by Vietnam and Malaysia in past years. The Philippine filing therefore joins a wider pattern of disputes over efforts by coastal states to pursue seabed rights through the United Nations process.

The main developments span several periods:

• Over fifteen years, the Philippines conducted surveys supporting its extended continental shelf submission.
• In 2016, an arbitration ruling invalidated China's nine dash line claims. Beijing continues to reject the award.
• On July 28, 2026, Manila formally presented its partial submission covering areas off western Palawan.
• By December 2026, foreign ministers hope negotiations on an ASEAN code of conduct with China can conclude.

ASEAN Diplomacy Faces Pressure at Sea

The Philippines has made progress on the code of conduct a priority during its chairmanship of ASEAN. The proposed code is intended to manage behavior and reduce the risk of conflict in the South China Sea, a busy waterway where maritime incidents continue to strain relations.

The new filing adds another point of disagreement to efforts to reach consensus this year. Philippine officials maintain that pursuing seabed rights through international law fits their broader goal of stability, while Beijing's objections show the political resistance surrounding that process.

Recent weeks have brought repeated confrontations involving coast guard vessels near Scarborough Shoal and Second Thomas Shoal. Reported incidents include the use of water cannon, blocking maneuvers and injuries to personnel.

China has also conducted military drills near the shoal and released new rules for a nature reserve in the area. Joint exercises involving the Philippines, the United States and Japan have drawn criticism from Beijing, adding to the tensions surrounding diplomacy.

Support for Navigation and Peaceful Resolution

The United States has reiterated its opposition to coercion and its support for freedom of navigation. Admiral Samuel Paparo warned that no nation should dominate the Indo Pacific and stressed deterrence through strength rather than confrontation.

ASEAN members continue to call for a peaceful resolution consistent with international law. Their position connects the effort to reduce risks at sea with the legal and diplomatic processes being pursued by the Philippines and other coastal states.

Manila's immediate task is to advance its scientific submission while maintaining discussions over overlapping claims and the proposed code of conduct. The commission's work, boundary negotiations and talks on maritime behavior each address a different part of the dispute.

Key Points

• The Philippines presented its partial extended continental shelf submission on July 28, 2026, following fifteen years of surveys.
• The claim concerns seabed and subsoil beyond 200 nautical miles off western Palawan, including deeper seabed around Pagasa Island.
• Article 76 allows extended continental shelf claims up to 350 nautical miles in some cases.
• China urged the United Nations commission not to consider the filing. Malaysia objected over overlapping maritime entitlements.
• Overlapping claims require separate boundary discussions, and Manila says sovereignty disputes remain open.
• The Philippines is chairing ASEAN as foreign ministers seek to conclude code of conduct talks with China by December 2026.
• Vessel confrontations, military activity and disagreement over the 2016 arbitration ruling continue to strain relations.