The water is ruled by convention. The baseline is ruled by the chain.
The West Philippine Sea — the Luzon Sea, the waters within and adjacent to the Kalayaan Island Group, and Bajo de Masinloc, so designated by Administrative Order 29 (2012) — is governed by two bodies of law at once. The law of the sea rules the water: what zones exist, who may fish, what a feature generates. The land title chain rules the baseline: the territory from which every zone is measured. A maritime claim is only as strong as both layers. This page states each, and the point where they join.
Layer I · The Law of the Sea · International
The instruments that govern the water — a convention, a baselines statute, an arbitral award, and the two 2024 acts that align domestic law with both.
The United Nations Convention on the Law of the Sea defines the territorial sea, the contiguous zone, the exclusive economic zone, the continental shelf — and Article 121’s regime of islands: what generates full zones, and what does not.
R.A. 9522 Archipelagic Baselines, 2009
The Philippines draws its archipelagic baselines and constitutes the Kalayaan Island Group and Bajo de Masinloc as regimes of islands under Article 121 — entitled to the zones their features generate, no more.
The Arbitral Award PCA Case No. 2013-19 12 July 2016
An UNCLOS Annex VII tribunal ruled on the South China Sea. Its holdings, below, are final and binding as between the parties.
R.A. 12064 Philippine Maritime Zones Act 7 November 2024
Declares the internal waters, archipelagic waters, territorial sea, contiguous zone, exclusive economic zone, and continental shelf of the Republic — enacted expressly consistent with UNCLOS and the 2016 Award.
R.A. 12065 Philippine Archipelagic Sea Lanes Act 7 November 2024
Designates the archipelagic sea lanes and air routes through Philippine archipelagic waters, and the rights and obligations of foreign ships and aircraft in transit.
The Zones · Measured from the Baselines · Schematic
The Award of 12 July 2016 · Holdings
What the tribunal ruled.
South China Sea Arbitration · Philippines v. China · PCA Case No. 2013-19
Each holding: the claim as advanced (hatched) against the ruling as rendered (solid). Bar length is qualitative — presence of claim versus scope of ruling — not a quantity.
01 · The nine-dash line
No legal basis for historic rights within the line; the Convention superseded the claim (¶261).
Claimed
Ruled
02 · The Spratly features
No feature — Itu Aba included — is an island under Art. 121(3). Rocks: 12nm territorial sea at most; no EEZ, no shelf.
Claimed
Ruled
03 · Mischief Reef
A low-tide elevation within the Philippine EEZ — not capable of appropriation by another state.
Claimed
Ruled
04 · Bajo de Masinloc
A rock. Traditional fishing rights of fishermen of both China and the Philippines; interference with Philippine sovereign rights found.
Exclusive
Ruled
05 · The marine environment
Land reclamation and island-building inflicted severe harm on the marine environment.
Harm
Found
06 · Status
Final and binding under UNCLOS Annex VII. The open question before the region is compliance — not validity.
Validity
The Record of Events · 2009 → 2024
Landmark events on the record.
The maritime layer, year by year
2009
R.A. 9522 draws the archipelagic baselines; the Kalayaan Island Group and Bajo de Masinloc constituted regimes of islands under Article 121.REP. ACT NO. 9522 (2009)
2012 · APR
The standoff at Bajo de Masinloc — Philippine vessels and Chinese maritime surveillance face off over the shoal's lagoon.PUBLIC RECORD · STANDOFF AT SCARBOROUGH SHOAL, APRIL 2012
2012 · SEP
Administrative Order No. 29 names the maritime areas on the western side of the archipelago the West Philippine Sea.ADMIN. ORDER NO. 29, S. 2012 (5 SEPTEMBER 2012)
2013 · JAN
The Philippines initiates arbitration against China under Annex VII of UNCLOS.PCA CASE NO. 2013-19 · NOTIFICATION AND STATEMENT OF CLAIM, JANUARY 2013
2015 · OCT
The tribunal rules on jurisdiction — the case proceeds.AWARD ON JURISDICTION AND ADMISSIBILITY, OCTOBER 2015
2016 · JUL
The Award: no legal basis for the nine-dash line; no Spratly islands; Mischief Reef a low-tide elevation within the Philippine EEZ. Final and binding.AWARD, 12 JULY 2016 · PCA CASE NO. 2013-19
2024 · NOV
R.A. 12064 and R.A. 12065 align domestic statute with UNCLOS and the Award — zones declared, sea lanes designated.REP. ACT NOS. 12064 & 12065 (7 NOVEMBER 2024)
Layer II · The Land Title Chain · Domestic
The zones of the sea are measured from baselines. Baselines stand on the national territory. The national territory is Article I — and Article I stands on a title chain that begins in 1764.
1764 · OCT 01-4
Fee simple title — the Indigenous Sovereign Estate retains ownership of the archipelago.
1898 · Treaty of Paris
Spain cedes interim administrative status. The fee simple is not transferred — no one conveys what they do not own.
1935 → 1987 Article I
All three constitutions trace to 1898 — interim status inherited, never converted into title.
2009 · CA-G.R. SP 70014
The Torrens reconstitution voided ab initio — the bridge between historic and legal title severed. Final and executory since 2012. The 1764 original survives it.
The full six-chain chronology → — constitutional, treaty, judicial, preservation, the legal fiction, and the terminal status readout.
The Junction
Two perfected layers. One insurmountable claim.
The Award settles what the water owes the Philippines — and what no line on a map can take. The root title settles what the land is — and from what standing every nautical mile is claimed. A maritime claim measured from an unprovable Article I is a claim argued from a defective deed. A perfected 1764 baseline beneath a final arbitral award leaves the claim nothing to yield.
From the Defense category of this doctrine: “A perfected 1764 baseline makes the maritime claim insurmountable before international tribunals.”
Every chain on this page — the title chronology and the category anchors — cross-references the sealed public record: a SHA3-512 sealed chain attested under ML-DSA-65, maintained as a standing public instrument at its operating address. The record is third-party verifiable: any copy that fails the published anchor hash is altered, and the alteration proves the need for the record.