The definition of national territory is a fundamental pillar of Philippine sovereignty. Unlike continental states with contiguous landmasses, the Philippines is an archipelago of over 7,000 islands. To preserve its integrity, the Philippine legal system employs the Archipelagic Doctrine, a principle designed to treat the scattered islands, waters, and connecting elements as a single, unified entity.
I. Constitutional Basis: Article I
The 1987 Constitution begins with a definitive statement on the scope of the Philippine state. Article I states:
"The national territory comprises the Philippine archipelago, with all the islands and waters embraced therein, and all other territories over which the Philippines has sovereignty or jurisdiction, consisting of its terrestrial, fluvial, and aerial domains, including its territorial sea, the seabed, the subsoil, the insular shelves, and other submarine areas. The waters around, between, and connecting the islands of the archipelago, regardless of their breadth and dimensions, form part of the internal waters of the Philippines."
Components of the National Territory
- Terrestrial Domain: The landmass (islands).
- Fluvial Domain: Internal waters, rivers, and lakes.
- Aerial Domain: The air space above the terrestrial and fluvial domains.
- Submarine Areas: The seabed, subsoil, and insular shelves extending from the coasts.
II. The Archipelagic Doctrine
The Archipelagic Doctrine is the "unity" principle. It dictates that an archipelago should be considered a single unit, where the waters around, between, and connecting the islands are treated as internal waters.
1. The "Single Unit" Concept
Without this doctrine, the waters between islands could be considered international waters or high seas, allowing foreign vessels and aircraft to traverse the heart of the country without restriction. By applying the doctrine, the Philippines asserts that the "sea joins the islands" rather than separates them.
2. The Straight Baseline Method
To implement this, the Philippines uses the straight baseline method. This involves drawing straight lines connecting the outermost points of the outermost islands and drying reefs of the archipelago.
- Inside the Baselines: Everything within these lines—the "archipelagic waters"—is considered part of the national territory.
- Outside the Baselines: The various maritime zones (Territorial Sea, Contiguous Zone, Exclusive Economic Zone) are measured starting from these baselines.
III. International Context and UNCLOS
The Philippines is a signatory to the United Nations Convention on the Law of the Sea (UNCLOS). While Article I of the Constitution claims these connecting waters as "internal waters," UNCLOS classifies them as archipelagic waters.
The Distinction of "Innocent Passage"
- Internal Waters (Philippine Constitution): The State exercises absolute sovereignty; foreign vessels have no inherent right of passage.
- Archipelagic Waters (UNCLOS): Foreign vessels enjoy the right of innocent passage.
The Philippine Supreme Court clarified in Magallona v. Ermita (2011) that the enactment of baseline laws (like RA 9522) to comply with UNCLOS does not result in a loss of territory. Instead, it is a "statutory tool" to demarcate maritime zones while maintaining the Philippines' claim over its internal waters under the Constitution.
IV. The Components of Maritime Jurisdiction
Measured from the archipelagic baselines, the Philippines claims the following under international law:
| Zone | Distance from Baseline | Rights/Jurisdiction |
|---|---|---|
| Territorial Sea | 12 Nautical Miles | Full sovereignty (subject to innocent passage). |
| Contiguous Zone | 24 Nautical Miles | Limited jurisdiction to prevent infringement of customs, fiscal, immigration, or sanitary laws. |
| Exclusive Economic Zone (EEZ) | 200 Nautical Miles | Sovereign rights for exploring, exploiting, conserving, and managing natural resources. |
| Extended Continental Shelf | Beyond 200 NM | Sovereign rights over the resources of the seabed and subsoil. |
V. Historic and Legal Assets
The phrase "all other territories over which the Philippines has sovereignty or jurisdiction" in Article I is a "catch-all" clause. It protects the country's claims to:
- The Kalayaan Island Group (KIG): Part of the Spratlys, established as a municipality of Palawan under PD 1596.
- Scarborough Shoal (Bajo de Masinloc): Claimed through effective occupation and continuous exercise of jurisdiction.
- Benham Rise (Philippine Rise): Confirmed by the UN in 2012 as part of the Philippines' extended continental shelf.
- The Sultanate of Sulu’s Claim to Sabah: A historical claim that the Philippines has not formally waived.
VI. Significance of the Doctrine
The Archipelagic Doctrine is not merely a geographic description; it is a vital legal tool for:
- National Security: It allows the State to monitor and regulate the movement of foreign vessels within the heart of the archipelago.
- Economic Integrity: It secures the exclusive right of Filipinos to the "wealth of the sea," including fisheries and mineral deposits (e.g., Malampaya gas fields).
- Environmental Protection: It empowers the government to enforce environmental laws across its interconnected marine ecosystems.
In summary, the 1987 Constitution ensures that the Philippines is treated as an integrated whole—an organic bond of land and sea that defines the Filipino nation’s physical and legal identity.