Exclusive Economic Zone

Also known as: EEZ · 200-nautical-mile zone · Economic zone

Definition

An exclusive economic zone (EEZ) is the maritime zone defined by Part V of the United Nations Convention on the Law of the Sea (UNCLOS), extending up to 200 nautical miles from the baselines from which the breadth of the territorial sea is measured, in which the coastal state holds “sovereign rights for the purpose of exploring and exploiting, conserving and managing the natural resources” of the waters, seabed, and subsoil, together with jurisdiction over artificial islands, marine scientific research, and environmental protection. Article 57 fixes the limit — “the exclusive economic zone shall not extend beyond 200 nautical miles from the baselines” — while Article 58 preserves the freedoms of navigation, overflight, and cable-laying for all states. The zone is thus a zone of rights, not of territory: the coastal state’s authority is over resources “below the surface of the sea,” while the surface waters remain international waters open to the ships of every nation. (UN — UNCLOS Part V, Wikipedia — Exclusive economic zone)

The Philippines claimed the zone before the Convention codified it: Presidential Decree No. 1599, signed by President Ferdinand E. Marcos on June 11, 1978, established a Philippine EEZ of 200 nautical miles with sovereign rights over its living and non-living resources, four years before UNCLOS was adopted at Montego Bay. The zone’s measurement rests on the national baselines — Republic Act No. 3046 of 1961, as amended by Republic Act No. 5446 of 1968, later redefined by the Baselines Law, Republic Act No. 9522 (March 10, 2009), which drew archipelagic baselines through 101 basepoints and treated the Kalayaan Island Group and Bajo de Masinloc (Scarborough Shoal) as a regime of islands under Article 121. The country’s EEZ law was consolidated in 2024: the Philippine Maritime Zones Act (Republic Act No. 12064, approved November 7, 2024) declares the internal waters, archipelagic waters, territorial sea, contiguous zone, EEZ, and continental shelf in terms consistent with UNCLOS, and the maritime zones on the archipelago’s western side — those within the nine-dash line’s overlap, whose dispute this wiki’s Nine-Dash Line and Philippines v. China entries document — carry the official name West Philippine Sea. (LawPhil — PD 1599, LawPhil — RA 9522, LawPhil — RA 12064, Wikipedia — West Philippine Sea)

Identities

Source	Identifier	URL
Wikipedia	Exclusive economic zone	https://en.wikipedia.org/wiki/Exclusive_economic_zone
Wikidata	exclusive economic zone (Q202008)	https://www.wikidata.org/wiki/Q202008
DBpedia	Exclusive_economic_zone	https://dbpedia.org/page/Exclusive_economic_zone
ProductOntology	N/A	N/A
Wiktionary	exclusive economic zone	https://en.wiktionary.org/wiki/exclusive_economic_zone
Library of Congress Subject Headings (LCSH)	N/A	N/A
MeSH	N/A	N/A
NCBI Taxonomy	N/A	N/A
AGROVOC	N/A	N/A
Google Scholar	exclusive economic zone UNCLOS Article 56 sovereign rights 200 nautical miles Philippines South China Sea arbitration	https://scholar.google.com/scholar?q=%22exclusive+economic+zone%22+UNCLOS+Philippines
ConceptNet	N/A	N/A
OpenCyc	N/A	N/A

Also Known As

EEZ
200-nautical-mile zone
Economic zone

Examples and Analogies

Owning the fish, not the water: the EEZ works like a concession over a public park — the coastal state has exclusive rights to the resources under and in the water column (fish, oil, gas, energy from currents and winds) while every state’s ships and aircraft keep the freedom of the surface, the rights-versus-sovereignty distinction Article 56 draws. (UN — UNCLOS Part V, Wikipedia — Exclusive economic zone)
Measured from the property line, not the shore: everything starts at the baselines, the drawn lines from which the territorial sea is measured; when the Philippines replaced its 1960s straight baselines with the archipelagic baselines of RA 9522 in 2009, the 200-nautical-mile clock itself was redrawn — a reminder that the zone is only as settled as the lines it starts from. (LawPhil — RA 9522)
A zone claimed by decree before it was a zone in law: PD 1599 gave the Philippines its EEZ in 1978, before UNCLOS concluded the concept in 1982 — the country legislating into international law what the treaty would later ratify, in the same national-assertion family as Chile’s and Peru’s 200-mile claims of 1947. (LawPhil — PD 1599, Wikipedia — Exclusive economic zone)
The shelf beyond the fence: the extended continental shelf is the seabed that may continue past 200 nautical miles — the Philippines’ Benham Rise claim, lodged on April 8, 2009 and approved by the UN Commission on the Limits of the Continental Shelf in 2012, added roughly 13 million hectares of seabed beyond the EEZ, renamed the Philippine Rise in 2017. (Wikipedia — Benham Plateau)
Verified data (legal regime and Philippine instruments):
Treaty basis: UNCLOS Part V, Articles 55–75; Article 56 (sovereign rights over resources, jurisdiction over installations, research, environment), Article 57 (breadth not beyond 200 nautical miles from baselines), Article 58 (navigation, overflight, cable freedoms of other states) (UN — UNCLOS Part V)
Philippine EEZ decree: PD No. 1599, June 11, 1978 — a zone “two hundred nautical miles beyond and from the baselines from which the territorial sea is measured,” with sovereign rights over the zone’s natural resources (LawPhil — PD 1599)
Baselines: RA 3046 (1961) as amended by RA 5446 (1968), amended by RA 9522 (March 10, 2009) — 101 basepoints in WGS 84, Kalayaan Island Group and Bajo de Masinloc as a regime of islands under Article 121 (LawPhil — RA 9522)
Naming: Administrative Order No. 29 (September 5, 2012) — “The maritime areas on the western side of the Philippine archipelago are hereby named as the West Philippine Sea,” citing PD 1599 and RA 9522 (Wikipedia — West Philippine Sea)
Codification: RA 12064, Philippine Maritime Zones Act (November 7, 2024) — Section 7, EEZ to 200 nautical miles, consistent with PD 1599 and UNCLOS (LawPhil — RA 12064)
Arbitral application: the 12 July 2016 award found no legal basis for Chinese historic rights to resources within the Philippines’ EEZ, and that Mischief Reef and Second Thomas Shoal are low-tide elevations within the Philippine EEZ and continental shelf (2016 Annex VII Award (RIAA))

Usage Scenarios

1. Fisheries Regulation and Enforcement

Coastal states administer their EEZs through fisheries law: the Philippines licenses and polices fishing in its zone under the Fisheries Code, whose corpus entry documents the regime, and enforcement at sea rests on Article 56’s resource rights — the basis on which Philippine agencies patrol grounds the 2016 award located inside the Philippine EEZ. (UN — UNCLOS Part V, 2016 Annex VII Award (RIAA))

2. Continental Shelf Submission and Seabed Rights

Maritime-area administration splits between the EEZ (water column and seabed to 200 nautical miles) and the extended continental shelf beyond, claimed through the UN Commission on the Limits of the Continental Shelf — the route by which the Philippines lodged its Benham Rise partial submission on April 8, 2009, approved in 2012, and then renamed the feature the Philippine Rise by Executive Order No. 25 on May 16, 2017. (Wikipedia — Benham Plateau)

3. Maritime Boundary Negotiation and Delimitation

Where coasts lie within 400 nautical miles of each other, EEZs overlap and states must negotiate boundaries, the situation that governs the Philippines’ delimitation problems with its neighbors in the South China Sea and the Pacific — disputes conducted in the vocabulary of Articles 74 and the zone’s entitlement rules. (Wikipedia — Exclusive economic zone, 2016 Annex VII Award (RIAA))

4. Mapping, Naming, and Public Communication

Cartographers and agencies apply the Philippine nomenclature layered on the zone: the West Philippine Sea name of AO 29 (2012), now statutory in RA 12064, applies to the western maritime areas claimed as part of the Philippine EEZ, and government maps carry both the zone and the disputes within it. (Wikipedia — West Philippine Sea, LawPhil — RA 12064)

Strategies

Keep sovereign rights and sovereignty apart. The EEZ grants “sovereign rights” over resources — functional, economic, exclusive — not sovereignty over the water or the airspace; the standard formulation that the rights run “below the surface of the sea” while the surface stays international is the discipline every accurate account of the zone requires. (UN — UNCLOS Part V, Wikipedia — Exclusive economic zone)
Anchor the zone to its baselines and their statute. The Philippine EEZ is only as definite as RA 3046 as amended through RA 9522; analysis of any feature’s place inside or outside the zone begins with the baselines law and Article 121’s regime-of-islands treatment of the KIG and Bajo de Masinloc. (LawPhil — RA 9522)
Delimit by agreement where zones overlap. UNCLOS’s EEZ does not self-execute against neighbors: overlapping claims proceed by agreement or adjudication, as the Philippine arbitration of 2013–2016 illustrates for the historic-rights question — even as that tribunal declined to decide sovereignty over features or boundary delimitation. (2016 Annex VII Award (RIAA), Wikipedia — Exclusive economic zone)
Codify domestically what the treaty gives internationally. The Philippine progression — decree (1978), baselines (2009), naming (2012), maritime zones act (2024) — shows the strategy of restating UNCLOS zones in national law so that agencies, courts, and maps share one statutory vocabulary. (LawPhil — PD 1599, LawPhil — RA 12064)

Security and Safety Measures

Enforce within the zone’s legal limits: Article 73 lets the coastal state board, inspect, arrest, and detain for fisheries violations in its EEZ, subject to prompt release and proportionate penalties — the license, and the restraint, of EEZ law enforcement. (UN — UNCLOS Part V)
Preserve navigation freedoms while asserting resource rights: the same treaty that grants the coastal state its resources guarantees every state’s navigation and overflight through the zone; safety at sea requires the dual register — Philippine enforcement and foreign transit — to operate without either side reading its right as the other’s exclusion. (UN — UNCLOS Part V, Wikipedia — Exclusive economic zone)
Document incidents inside the EEZ as the award frames them: agencies patrolling waters around Mischief Reef and Second Thomas Shoal — low-tide elevations the 2016 award placed within the Philippine EEZ and continental shelf — work from the award’s findings as the documented record for protests and reports, the practice this wiki’s Philippines v. China entry describes. (2016 Annex VII Award (RIAA))
Separate fishery access from territorial disputes: the award’s treatment of traditional fishing at Scarborough Shoal and of China’s interference with Philippine fishermen since 2012 frames the safety of fishers as a legal question with a documented answer, distinct from the sovereignty claims over the features themselves. (2016 Annex VII Award (RIAA))

Historical Context

The zone’s prehistory runs from the Truman Proclamation of 1945, one of the first assertions of exclusive jurisdiction beyond the traditional territorial sea, to the 200-nautical-mile claims Chile and Peru made in 1947 — Latin American assertions of coastal-state resource rights that pushed the measure international law would eventually adopt. UNCLOS, negotiated at the Third UN Conference and opened for signature at Montego Bay on December 10, 1982, settled the design in Part V: 200 nautical miles, sovereign rights over resources, freedom of navigation on the surface, and compulsory dispute settlement behind it, the treaty this wiki’s United Nations Convention on the Law of the Sea entry documents in full. (Wikipedia — Exclusive economic zone, UN — UNCLOS Part V)

The Philippines had claimed its zone by decree before the treaty text existed: PD 1599 of June 11, 1978 asserted a 200-nautical-mile EEZ from the national baselines, and the country ratified UNCLOS on May 8, 1984, among the early parties. The baselines law of 1961–1968 was redrawn by RA 9522 in 2009 to conform to the archipelagic-baseline rules, and in the same year the Philippines lodged its Benham Rise extended-continental-shelf submission, approved by the Commission on the Limits of the Continental Shelf in 2012 — the seabed entitlement beyond the EEZ’s 200 miles. (LawPhil — PD 1599, LawPhil — RA 9522, Wikipedia — Benham Plateau)

The EEZ became the center of the country’s defining legal contest in the 2010s. Administrative Order No. 29 of September 5, 2012 named the western maritime areas the West Philippine Sea; the arbitration the Philippines instituted in 2013 ended in the award of July 12, 2016, which held that China’s nine-dash-line historic-rights claim had no legal basis insofar as it exceeded UNCLOS’s zones and that Mischief Reef and Second Thomas Shoal lie within the Philippine EEZ and continental shelf. The Philippine Maritime Zones Act of November 7, 2024 restated the entire zone architecture — internal waters through continental shelf, EEZ at 200 nautical miles, the West Philippine Sea name — as national statute, the corpus’s most recent word on the zone. (Wikipedia — West Philippine Sea, 2016 Annex VII Award (RIAA), LawPhil — RA 12064)

Challenges and Controversies

Rights or Territory? The Standing Confusion

The most persistent controversy around the EEZ is misdescription: the zone is routinely reported as if the coastal state owned 200 nautical miles of sea, when Article 56 grants only sovereign rights over resources and Article 58 keeps the surface international. The distinction is load-bearing in the South China Sea disputes, where the difference between contesting fish and oil inside a zone and contesting the water itself determines what any claim can lawfully assert. (UN — UNCLOS Part V, Wikipedia — Exclusive economic zone)

The Philippine EEZ and the Nine-Dash Line

Within the Philippine EEZ’s western arc, the documented dispute runs between the UNCLOS entitlement and China’s nine-dash-line claim: the 2016 award’s holding — no historic rights to resources within the line, and low-tide elevations within the Philippine EEZ at Mischief Reef and Second Thomas Shoal — against China’s rejection of the award and continued assertion, the record this wiki’s Nine-Dash Line entry carries. (2016 Annex VII Award (RIAA), Wikipedia — West Philippine Sea)

How Big Is the Philippine EEZ?

Even the zone’s size is contested by the sources: the standard reference article gives the Philippine EEZ as 2,263,816 square kilometers in its country section while its rankings table lists 1,590,780 square kilometers — an unexplained internal variance between total-claim and delimited-area figures that no official Philippine figure currently reconciles. Encyclopedic use should carry the variance rather than round it away. (Wikipedia — Exclusive economic zone)

The EEZ and the Extended Shelf

The boundary between the EEZ and the continental shelf generates its own disputes: the shelf’s legal regime (Part VI) reaches where the EEZ stops, and features such as Benham Rise belong to the shelf-and-ECS conversation rather than to EEZ fisheries — a distinction the 2017 renaming of the rise and the 2009–2012 submission process illustrate, and one that escalations in the eastern seaboard would immediately engage. (Wikipedia — Benham Plateau, UN — UNCLOS Part V)