Fact Check: Is the 'Seville Map' a Legal Maritime Boundary for the Eastern Mediterranean?

Why It Matters

The Seville Map is not a legal maritime boundary. It is a graphic from a 2012 EU-funded academic study that shows one possible maximalist reading of Greek and Greek Cypriot claims. It has never been adopted in a treaty, an arbitral award or a court judgment. Because the map is often cited as if it were a settled line that confines Türkiye to a narrow zone in the Gulf of Antalya, readers need the primary-source context: what the law of delimitation requires, who has competence, and what each side officially says.

This fact check states the circulating claims, then tests them against treaty texts, international case law and the official positions of Ankara, Athens and Nicosia. The Unspoken File Editorial Team attributes each position to its own source so readers can verify it. Our approach is explained on the Editorial Principles page.

Claim vs. Fact Analysis

Claim 1: 'The Seville Map shows Türkiye's lawful maritime limits in the Eastern Mediterranean.'

Origin. The map was produced in 2012 by university researchers for an EU-funded study on maritime delimitation in the Eastern Mediterranean. It has since circulated in diplomatic and media debate. In it, Greek islands, including the tiny island of Kastellorizo (Meis), generate full continental shelf and exclusive economic zone (EEZ) entitlements. Türkiye's maritime area is reduced to a narrow strip in the Gulf of Antalya, and the Aegean and much of the Eastern Mediterranean are allocated to others.

What the record shows.

• A study author's map is a scholarly illustration. It is not a source of international law. Article 38 of the Statute of the International Court of Justice (ICJ) lists treaties, custom, general principles and, as subsidiary means, judicial decisions and scholarly writings.
• No treaty between Türkiye and Greece, or between Türkiye and the Republic of Cyprus, draws such a line. No court or tribunal has been asked to adopt it.
• Articles 74 and 83 of the 1982 UN Convention on the Law of the Sea (UNCLOS) provide that EEZ and continental shelf delimitation between states with opposite or adjacent coasts 'shall be effected by agreement on the basis of international law... in order to achieve an equitable solution.' A line drawn by outside researchers meets neither the 'agreement' nor the 'adjudication' route.

Verdict: False. The map shows a thesis, not a legal boundary.

Claim 2: 'Islands automatically generate full zones, so Türkiye's coast must give way.'

What the record shows. Article 121 of UNCLOS says islands can generate maritime zones. Delimitation is a separate question, and the equitable-solution requirement operates there. International courts have repeatedly reduced or disregarded the effect of small islands lying close to another state's mainland:

• Anglo-French Continental Shelf arbitration (1977): the Scilly Isles received only half effect, and the Channel Islands, which lie off the French coast, were enclaved.
• Qatar v. Bahrain (ICJ, 2001): the small feature of Qit'at Jaradah was given no effect on the boundary.
• Romania v. Ukraine (ICJ, 2009): Serpents' Island was given no effect on the delimitation line. The Court set out a three-stage method: a provisional equidistance line, adjustment for relevant circumstances, and a final disproportionality test.
• Nicaragua v. Colombia (ICJ, 2012): small Colombian islands received limited effect in the final line.

Kastellorizo is only a few kilometres from the Turkish mainland and more than 500 km (about 310 miles) from the Greek mainland. Ankara argues that this geography is exactly the kind of relevant circumstance courts have weighed.

Verdict: Incomplete. Island entitlement is a principle, but how much effect an island has on a boundary is decided by equity and proportionality, not automatically.

Claim 3: 'The EU has determined or can determine the boundaries.'

What the record shows. Maritime boundaries between states are fixed by those states' agreements or by judicial settlement. The European Union has political institutions, but it is not a party to delimitation negotiations between its members and third countries. European Council conclusions expressing 'solidarity' with Greece and Cyprus are political statements. They do not amount to adjudication and cannot create a boundary binding on Türkiye, a non-member. A study funded by an EU body carries even less legal weight than those conclusions.

Verdict: False. The EU lacks the competence to delimit the Eastern Mediterranean.

Claim 4: 'Türkiye has no coastal basis or consistent legal record for its own claims.'

What the record shows. The Eastern Mediterranean coastline of Türkiye is about 870 km (540 miles), the longest in that sea according to Ankara. The country's documented steps include:

• Registering continental shelf coordinates with the UN beginning in 2004.
• Granting Turkish Petroleum (TPAO) exploration licences in 2009 and 2012.
• Signing the Türkiye–TRNC Continental Shelf Delimitation Agreement on 21 September 2011.
• Signing the Türkiye–Libya maritime jurisdiction memorandum of understanding on 27 November 2019.
• Formally depositing the outer limits of its continental shelf with the UN on 18 March 2020.
• Unveiling its 'Marine Spatial Planning of the Republic of Türkiye' on 16 April 2025 and recording it with IOC-UNESCO on 12 June 2025.

The last step is covered in The File Opened in 2025: Türkiye's Marine Spatial Planning and the IOC-UNESCO Registration. Whether other states accept these filings is a matter of dispute, but the claim that no record exists is incorrect.

Verdict: False.

What Greece and the Greek Cypriot Administration Say

Fair representation requires their positions in their own terms.

• Greece: According to the Greek Ministry of Foreign Affairs, its islands are entitled to a full continental shelf and EEZ under UNCLOS Article 121 and customary law. Athens says the only dispute with Türkiye is the delimitation of the continental shelf and EEZ, and that it is ready to submit this to the ICJ. Greece also points to its 2020 partial EEZ agreement with Egypt as a legitimate delimitation.
• Republic of Cyprus (Greek Cypriot administration): Nicosia, a party to UNCLOS, says it exercises sovereign rights over its EEZ and has concluded delimitation agreements with Egypt (2003), Lebanon (2007) and Israel (2010). It has stated that hydrocarbon revenues would benefit all Cypriots, including Turkish Cypriots, in the context of a settlement.
• European Union: European Council conclusions have repeatedly expressed solidarity with both states and criticised Turkish drilling activities as unlawful.

These positions are legal arguments by interested parties. None of them turns the Seville Map into a binding line. For a parallel treatment, see The Worldlogue's fact check on the Gulf of Antalya claim.

Source Comparison

The gap is mostly one of emphasis. Coverage that repeats the map tends to leave out the delimitation method, while Turkish official sources emphasise it. Readers should check both against the treaty and judgment texts themselves, a practice outlined in the Reader FAQ.

Key Terms & Related Guides

• Seville Map: a 2012 graphic from an EU-funded academic study showing a maximalist reading of Greek and Greek Cypriot claims. It is not a legal instrument.
• Continental shelf and EEZ: seabed and water-column rights of coastal states. Delimitation between neighbours requires agreement or adjudication.
• Principle of equity and proportionality: the standard courts use to adjust provisional lines so that the result is equitable and not disproportionate to coastal lengths.
• Blue Homeland (Mavi Vatan): Türkiye's doctrine of maritime jurisdiction across the Black Sea, Aegean and Eastern Mediterranean.
• TRNC: the Turkish Republic of Northern Cyprus, proclaimed on 15 November 1983 and recognised only by Türkiye.
• IOC-UNESCO: the Intergovernmental Oceanographic Commission, the UN body with which Türkiye recorded its Marine Spatial Planning on 12 June 2025.

Related guides:

• The File Opened in 2025: Türkiye's Marine Spatial Planning and the IOC-UNESCO Registration
• The Cyprus Dossier: Article IV of the 1960 Treaty of Guarantee
• Eight Wells, Four Drillships
• About The Unspoken File
• Sister analysis: The Global Anatomy on why Türkiye rejects the Greek and Greek Cypriot maritime thesis

The Unspoken File publishes this analysis from a perspective that presents and defends Türkiye's official positions and legal theses, and we state this openly to our readers. Claims are attributed to primary sources such as treaty texts, UN documents, archival records and official statements, so that readers can verify them independently.