In the Matter of the South China Sea Arbitration

China's claims to historic rights within the nine-dash line are incompatible with UNCLOS and superseded by the Convention's comprehensive maritime zone regime. No high-tide feature in the Spratly Islands constitutes a fully entitled island under Article 121(3) — all are "rocks" that cannot sustain human habitation or economic life of their own. Mischief Reef and Second Thomas Shoal are low-tide elevations within the Philippines' EEZ and continental shelf. China violated Articles 56, 58(3), 60, 77, 80, 94, 123, 192, 194, 197, 206, 279, and 300 of UNCLOS.

The South China Sea is a semi-enclosed sea spanning approximately 3.5 million square kilometres, bordered by China, the Philippines, Vietnam, Malaysia, Brunei, Singapore, and Indonesia. It contains the Spratly Islands — a constellation of small islands, reefs, and submerged features — and Scarborough Shoal. Multiple states claim sovereignty over various features. China's claims are marked by a "nine-dash line" on official maps, first appearing in 1948, encompassing approximately 80% of the South China Sea. Both the Philippines and China are parties to UNCLOS. The Convention does not address sovereignty over land territory, and the Tribunal expressly disclaimed any ruling on sovereignty.

• 22 January 2013: Philippines initiated arbitration under Annex VII of UNCLOS
• 19 February 2013: China rejected and returned the Notification and Statement of Claim
• 21 June 2013: Tribunal constituted (China did not appoint an arbitrator; President of ITLOS made appointments)
• 30 March 2014: Philippines filed Memorial with 15 Submissions
• 7 December 2014: China published Position Paper on jurisdiction
• 29 October 2015: Tribunal issued Award on Jurisdiction and Admissibility (unanimous)
• 24–30 November 2015: Hearing on the Merits (China did not attend)
• 12 July 2016: Tribunal issued Final Award (unanimous)

• The Philippines brought 15 Submissions concerning: (1–2) the legal basis of maritime entitlements and the nine-dash line; (3–7) the status of specific features (Scarborough Shoal, Mischief Reef, Second Thomas Shoal, Subi Reef, Gaven Reef, McKennan Reef, Johnson Reef, Cuarteron Reef, Fiery Cross Reef); (8–13) China's interference with Philippine sovereign rights, failure to prevent Chinese fishing in the Philippine EEZ, prevention of traditional Filipino fishing at Scarborough Shoal, environmental harm from fishing practices and construction, construction at Mischief Reef, and dangerous operation of law enforcement vessels; (14) aggravation of the dispute; (15) future conduct of the parties.
• China consistently refused to participate, arguing the Tribunal lacked jurisdiction. China's Position Paper argued the dispute was about territorial sovereignty, that bilateral negotiations were agreed, and that the claims constituted part of maritime delimitation.
• China undertook massive island-building at seven reefs beginning in late 2013, creating over 12.8 million square metres of new land.
• Chinese fishing vessels engaged in harvesting endangered species (giant clams, sea turtles, corals) and destructive fishing methods (cyanide, dynamite, propeller-chopping), often under protection of Chinese government vessels.
• Chinese law enforcement vessels operated dangerously near Scarborough Shoal in April and May 2012.
• China prevented rotation and resupply of Philippine personnel at Second Thomas Shoal in March 2014.

• China's maritime entitlements must be based on UNCLOS, not historic rights; the nine-dash line is without lawful effect
• All features in the Spratly Islands and Scarborough Shoal are either low-tide elevations or "rocks" under Article 121(3) incapable of generating an EEZ or continental shelf
• Mischief Reef and Second Thomas Shoal are low-tide elevations within the Philippine EEZ
• China unlawfully interfered with Philippine sovereign rights over living and non-living resources
• China failed to prevent its nationals from exploiting Philippine living resources
• China unlawfully prevented traditional Filipino fishing at Scarborough Shoal
• China violated environmental obligations through toleration of destructive fishing and massive island-building
• China's construction at Mischief Reef violated UNCLOS provisions on artificial islands and constituted attempted appropriation
• China operated law enforcement vessels dangerously, violating COLREGS
• China aggravated and extended the dispute during proceedings
• The Tribunal has jurisdiction over all claims; China's 2006 declaration under Article 298 does not bar jurisdiction

• China did not formally participate but articulated its position through its Position Paper, diplomatic communications, and public statements
• The Tribunal manifestly lacks jurisdiction because the dispute concerns territorial sovereignty over islands
• China and the Philippines agreed to settle disputes through bilateral negotiations (DOC, joint statements)
• The disputes constitute an integral part of maritime delimitation, excluded by China's 2006 declaration under Article 298
• China has indisputable sovereignty over the Nansha Islands and adjacent waters
• China's rights in the South China Sea were formed over a long historical course and are protected under international law including UNCLOS
• The Philippines failed to exchange views on dispute settlement as required by Article 283
• The arbitration constitutes an abuse of compulsory procedures under UNCLOS
• China's construction activities are lawful, within its sovereignty, primarily civilian in purpose, and do not harm the marine environment
• Taiping Dao (Itu Aba) is a fully entitled island capable of sustaining human habitation

Procedural Issues: - Whether the Tribunal has jurisdiction given China's non-participation - Whether the DOC, joint statements, TAC, and CBD preclude recourse to compulsory arbitration under Articles 281/282 - Whether the parties exchanged views as required by Article 283 - Whether China's 2006 declaration under Article 298 excludes jurisdiction over the Philippines' claims - Whether indispensable third parties (Vietnam, Malaysia) are required - Whether the Philippines' initiation of arbitration constitutes abuse of process

Substantive Issues: - Whether China's claims to historic rights within the nine-dash line are compatible with UNCLOS - Whether the specified features are low-tide elevations, rocks, or fully entitled islands under Articles 13 and 121 - Whether China violated the Philippines' sovereign rights in its EEZ and continental shelf - Whether China failed to prevent its nationals from exploiting Philippine living resources - Whether China unlawfully prevented traditional Filipino fishing at Scarborough Shoal - Whether China breached environmental obligations under Part XII of UNCLOS - Whether China's construction at Mischief Reef violated UNCLOS - Whether China operated law enforcement vessels dangerously in violation of COLREGS - Whether China aggravated and extended the dispute during proceedings

Procedural: - The Tribunal was properly constituted under Annex VII. China's non-participation does not deprive the Tribunal of jurisdiction (Article 9, Annex VII). The Philippines' initiation did not constitute abuse of process. No indispensable third party is required. The DOC, joint statements, TAC, and CBD do not preclude recourse to compulsory arbitration. The parties exchanged views as required by Article 283. China's 2006 declaration under Article 298 does not bar jurisdiction over the claims brought, because: (a) the claims do not concern sovereignty; (b) disputes over entitlements are distinct from maritime delimitation; (c) China's historic rights claims are not "historic titles" within Article 298(1)(a)(i); (d) construction activities are not "military activities" under Article 298(1)(b); (e) the law enforcement exception under Article 298(1)(b) does not apply to activities in another state's EEZ or in the territorial sea.

Substantive: - Nine-dash line and historic rights: The Convention supersedes any historic rights to living and non-living resources within the nine-dash line that exceed the limits of China's maritime entitlements under UNCLOS. The Convention is comprehensive and leaves no space for historic rights at variance with its provisions. China's negotiating position during the Third UN Conference confirmed this interpretation. - Status of features: Scarborough Shoal, Cuarteron Reef, Fiery Cross Reef, Johnson Reef, Gaven Reef (North), and McKennan Reef are high-tide features but are "rocks" under Article 121(3) — they cannot sustain human habitation or economic life of their own and generate no EEZ or continental shelf. Mischief Reef, Second Thomas Shoal, Subi Reef, Hughes Reef, and Gaven Reef (South) are low-tide elevations. No high-tide feature in the Spratly Islands is a fully entitled island under Article 121(3). - Mischief Reef and Second Thomas Shoal are low-tide elevations within the Philippines' EEZ and continental shelf. No overlapping entitlements exist. - Sovereign rights violations: China breached Article 77 by interfering with the M/V Veritas Voyager at Reed Bank. China breached Article 56 by promulgating a fishing moratorium applicable to the Philippine EEZ. China breached Article 58(3) by failing to prevent Chinese fishing at Mischief Reef and Second Thomas Shoal. - Traditional fishing: China unlawfully prevented Filipino fishermen from engaging in traditional fishing at Scarborough Shoal, violating Article 2(3) and customary international law protecting vested fishing rights in the territorial sea. - Environment: China breached Articles 192 and 194(5) by tolerating and protecting destructive fishing and harvesting of endangered species. China breached Articles 123, 192, 194(1), 194(5), 197, and 206 through massive island-building causing severe, irreparable harm to coral reef ecosystems, failing to cooperate with neighbouring states, and failing to conduct or communicate an environmental impact assessment. - Mischief Reef construction: China breached Articles 60 and 80 by constructing artificial islands and installations at Mischief Reef without Philippine authorization. Mischief Reef is not capable of appropriation as a low-tide elevation. - Dangerous navigation: China breached Article 94 and COLREGS Rules 2, 6, 7, 8, 15, and 16 through dangerous manoeuvres by law enforcement vessels near Scarborough Shoal in April and May 2012. - Aggravation: China breached Articles 279, 296, and 300 by aggravating and extending the dispute through island-building during proceedings, destroying evidence of natural conditions, and creating a fait accompli at Mischief Reef.

• Article 121(3) — Regime of Islands / "Rocks" Doctrine — High-tide features that cannot sustain human habitation or economic life of their own have no EEZ or continental shelf. The test is disjunctive: ability to sustain either human habitation OR economic life suffices for full entitlement. Capacity is assessed in natural condition, without artificial enhancement. "Human habitation" requires a stable community residing on the feature. "Economic life of their own" must be oriented around the feature itself, not solely dependent on external resources or extractive activities without local population involvement. Size is not dispositive but may be indicative.

• Article 13 — Low-Tide Elevations — Features submerged at high tide are low-tide elevations. They generate no maritime zones of their own (except where within the territorial sea of a high-tide feature, where they may serve as baselines). They cannot be appropriated.

• Historic Rights under UNCLOS — The Convention's comprehensive maritime zone regime supersedes any pre-existing historic rights to resources that are incompatible with its provisions. The Convention does not expressly preserve historic rights to the EEZ or continental shelf. China's historic rights claims are not "historic titles" within Article 298(1)(a)(i).

• Due Regard (Article 58(3)) — States exercising rights in another state's EEZ must have due regard to the coastal state's rights. This includes a due diligence obligation to prevent fishing by nationals in another state's EEZ.

• Obligation to Protect and Preserve the Marine Environment (Articles 192, 194) — A general obligation applying to all maritime areas. Requires active measures to prevent harm, including protection of rare or fragile ecosystems and endangered species. Informed by CITES, CBD, and customary international law.

• Environmental Impact Assessment (Article 206) — States must assess potential environmental effects of planned activities likely to cause significant harm and communicate results to competent international organizations.

• Duty Not to Aggravate Disputes — A principle of international law requiring parties to dispute settlement proceedings to refrain from actions that aggravate or extend the dispute. Inherent in Articles 279, 296, and 300 of UNCLOS and general international law.

• Traditional Fishing Rights in the Territorial Sea — Protected under customary international law as vested rights, incorporated through Article 2(3) of UNCLOS. Coastal states may regulate but not entirely prevent traditional artisanal fishing by foreign nationals in their territorial sea.

• COLREGS as Incorporated by Article 94 — The Convention on the International Regulations for Preventing Collisions at Sea constitutes "generally accepted international regulations" binding on flag states under Article 94(5).

• "The Convention was adopted as a 'constitution for the oceans,' in order to 'settle all issues relating to the law of the sea.'" (para. 4)

• "China's claim to historic rights to the living and non-living resources within the 'nine-dash line' is incompatible with the Convention to the extent that it exceeds the limits of China's maritime zones as provided for by the Convention." (para. 261)

• "Upon China's accession to the Convention and its entry into force, any historic rights that China may have had to the living and non-living resources within the 'nine-dash line' were superseded, as a matter of law and as between the Philippines and China, by the limits of the maritime zones provided for by the Convention." (para. 262)

• "The Tribunal considers that the human habitation with which the drafters of Article 121(3) were concerned was the habitation by a portion of the population for whose benefit the exclusive economic zone was being introduced." (para. 517)

• "The Tribunal sees no indication that anything fairly resembling a stable human community has ever formed on the Spratly Islands." (para. 621)

• "China's recent construction activities have and will cause environmental harm to coral reefs... on a scale unprecedented in the region." (para. 979, citing Ferse Report)

• "Although China does not accept and is not participating in this arbitration, it has stated its position... the Tribunal has sought to take into account China's position to the extent it is discernible from China's official statements and conduct." (para. 115)

• Territorial and Maritime Dispute (Nicaragua v. Colombia), ICJ Reports 2012 — Cited for the principle that low-tide elevations cannot be appropriated and that international law prescribes no minimum size for an island under Article 121; also for the treatment of coral features as "rocks"

• Fisheries Jurisdiction (United Kingdom v. Iceland), ICJ Reports 1974 — Distinguished; the Tribunal noted that the law applied there predated the consensus on the exclusive economic zone

• Delimitation of the Maritime Boundary in the Gulf of Maine Area (Canada v. United States), ICJ Reports 1984 — Cited for the principle that historic fishing on the high seas does not survive the establishment of exclusive economic zones

• Eritrea v. Yemen, RIAA Vol. XXII — Distinguished; the Tribunal noted that the applicable law in that arbitration permitted consideration of factors beyond UNCLOS

• Chagos Marine Protected Area Arbitration (Mauritius v. United Kingdom), Award of 18 March 2015 — Cited for the interpretation of "due regard" and the obligation to protect the marine environment

• Arctic Sunrise Arbitration (Netherlands v. Russia) — Cited for principles regarding non-participation in proceedings and the treatment of communications from non-appearing parties

• Military and Paramilitary Activities in and against Nicaragua (Nicaragua v. United States), ICJ Reports 1986 — Cited for the principle that a non-appearing party remains bound by the award

• Electricity Company of Sofia and Bulgaria (Belgium v. Bulgaria), PCIJ Series A/B No. 79 — Cited for the universally accepted principle that parties must refrain from aggravating or extending a dispute

• United States Diplomatic and Consular Staff in Tehran (United States v. Iran), ICJ Reports 1980 — Cited for the obligation not to aggravate disputes

• Anglo-Norwegian Fisheries (United Kingdom v. Norway), ICJ Reports 1951 — Cited for the concept of historic waters and historic title

• Monetary Gold Removed from Rome in 1943, ICJ Reports 1954 — Cited and distinguished regarding the indispensable third-party principle

• The Paquete Habana, 175 U.S. 677 (1900) — Cited for the recognition of customary international law protecting traditional fishing

• Abyei Arbitration (Government of Sudan v. Sudan People's Liberation Movement/Army) — Cited for the protection of traditional rights in boundary delimitation

• North Atlantic Coast Fisheries Arbitration — Cited for the principle that traditional fishing rights are subject to reasonable regulation

• Construction of a Road (Nicaragua v. Costa Rica), ICJ Reports 2015 — Cited for the standard of evidence required to demonstrate an environmental impact assessment

• Pulp Mills on the River Uruguay (Argentina v. Uruguay), ICJ Reports 2010 — Cited for due diligence obligations and the duty to cooperate in environmental protection

• MOX Plant (Ireland v. United Kingdom), ITLOS Provisional Measures — Cited for the duty to cooperate in protection of the marine environment

• Fisheries Advisory Opinion, ITLOS Reports 2015 — Cited for flag state obligations to prevent IUU fishing and the due diligence standard

• UNCLOS Article 2(3) — Sovereignty over territorial sea exercised subject to Convention and other rules of international law (traditional fishing rights)
• UNCLOS Article 13 — Definition and regime of low-tide elevations
• UNCLOS Article 56 — Sovereign rights in the EEZ (living and non-living resources)
• UNCLOS Article 58 — Rights and duties of other states in the EEZ; obligation of due regard
• UNCLOS Article 60 — Exclusive right to construct artificial islands in the EEZ
• UNCLOS Article 77 — Sovereign rights over the continental shelf
• UNCLOS Article 80 — Article 60 applies mutatis mutandis to continental shelf
• UNCLOS Article 94 — Flag state duties including compliance with COLREGS
• UNCLOS Article 121 — Regime of islands; paragraph (3) "rocks" limitation
• UNCLOS Article 123 — Cooperation of states bordering semi-enclosed seas
• UNCLOS Article 192 — General obligation to protect and preserve the marine environment
• UNCLOS Article 194 — Measures to prevent, reduce, and control marine pollution; protection of fragile ecosystems and endangered species
• UNCLOS Article 197 — Cooperation for protection of the marine environment
• UNCLOS Article 206 — Environmental impact assessment
• UNCLOS Article 279 — Obligation to settle disputes by peaceful means
• UNCLOS Article 296 — Finality and binding force of decisions
• UNCLOS Article 298 — Optional exceptions (historic bays/titles, military activities, law enforcement, maritime delimitation)
• UNCLOS Article 300 — Good faith and abuse of rights
• UNCLOS Article 311 — Relation to other conventions and international agreements
• UNCLOS Annex VII, Article 9 — Default of appearance
• COLREGS Rules 2, 6, 7, 8, 15, 16 — Collision prevention regulations
• Vienna Convention on the Law of Treaties Articles 31, 32, 33 — Treaty interpretation

N/A — The Award was unanimous.

N/A — The Award was unanimous. China did not participate and did not file any separate opinions.