Continental Shelf Limits

Concept International Law Preferred

Outer boundary of a coastal State's continental shelf, set at 200 nautical miles or the continental margin's edge.

Independent referenceNot an official or legal definition
Sources citedSee the sources at the end of this page
Status Under reviewLast updated 11 October 2026
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Definition

In plain language

A coastal State has rights over the seabed extending from its coast. These rules say how far that seabed zone reaches, normally 200 nautical miles and in some cases farther.

Academic definition

Article 76 of UNCLOS defines the continental shelf as extending to the outer edge of the continental margin or to 200 nautical miles from the baselines where the margin does not extend that far. Where it does, the outer limit is fixed by formulae and may not exceed 350 nautical miles from the baselines or 100 nautical miles from the 2,500 metre isobath (Article 76(5)). A State must submit information to the Commission on the Limits of the Continental Shelf, and limits established on the basis of its recommendations are final and binding (Article 76(8)).

Classification

Term type
Concept
Category
International Law
Subject field
Law of the Sea
Subfield
Continental Shelf
Difficulty level
Advanced
Grammatical category
noun phrase

Language variants

Alternative terms
  • outer limits of the continental shelf
  • limits of the continental shelf
Non-preferred terms
  • not_applicable
Abbreviations
  • not_applicable
Acronyms
  • not_applicable
Native terms
  • limites du plateau continental (French)
Transliteration
not_applicable
Pronunciation
not_applicable

Context

Legal effect: Binding

Scope

Covers the outer limits of the shelf and the Commission procedure; delimitation between neighbouring States and the exclusive economic zone are covered in separate records.

Legal context

UNCLOS Article 76 and Annex II establishing the Commission on the Limits of the Continental Shelf; Article 77 gives sovereign rights over seabed resources, and revenue sharing from exploitation beyond 200 nautical miles is required by Article 82. The ICJ treated the shelf as a natural prolongation in North Sea Continental Shelf (1969).

Diplomatic context

States file submissions and often object to overlapping claims, as in the Arctic, where several States seek extended shelf rights.

Institutional context

Administered by the Commission on the Limits of the Continental Shelf, supported by the UN Division for Ocean Affairs and the Law of the Sea.

Historical context

The 1945 Truman Proclamation on the continental shelf began claims, which were developed in the 1958 Geneva Convention and UNCLOS in 1982.

Why it matters

The limit determines where a State has exclusive rights over oil, gas and seabed resources, and where the international Area begins.

Usage

Register: Legal

Usage note

Use 'extended continental shelf' for claims beyond 200 nautical miles, and avoid confusing legal shelf with the geological shelf.

Example

The State filed a submission with the Commission to establish the outer limits of its continental shelf beyond 200 nautical miles.

Example scenario

State A's seabed margin extends farther than 200 nautical miles. It submits scientific data to the Commission, receives recommendations and then publishes limits that become final and binding on other States.

Common misuse

Using the geological definition of the shelf; the legal continental shelf is defined by Article 76, not by geology alone.

Not to be confused with

  • Exclusive economic zone
  • Delimitation of maritime boundaries
  • The Area (seabed beyond national jurisdiction)

Sources

  1. United Nations Convention on the Law of the Sea (1982), United Nations, Article 76 and Annex II. un.org
  2. Official definition. not_found_in_source
  3. Treaty reference. un.org
  4. Churchill and Lowe, The Law of the Sea. not_found_in_source
  5. not_found_in_source. not_found_in_source

Source type: Treaty. Source reliability: Primary.

This entry is an independent reference definition, not an official or legally binding text. Where an official definition exists, it is linked above and is authoritative. Read our methodology.

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