Fact Check: Does the 'Seville Map' Settle Maritime Boundaries in the Eastern Mediterranean?

Why It Matters

The 'Seville Map' is a maximalist illustration of Greek and Greek Cypriot maritime zones attributed to a University of Seville research team and circulated in EU circles in 2020. It is not a treaty, court award, UN registration or agreed delimitation, so it cannot settle Eastern Mediterranean boundaries or define Türkiye's continental shelf.

The claim. Greek and Greek Cypriot press and political commentary, and some EU-oriented media and think-tank pieces, have repeatedly presented the map as showing 'the' maritime zones of the Eastern Mediterranean, with Türkiye confined to a narrow strip in the Gulf of Antalya. This is a paraphrase of a recurring framing, not a quotation from one document.

The verdict. The map is a study-based illustration, not a legal instrument. Accurate context matters because maps carry persuasive weight in energy, defence and EU policy debates even when they carry no legal force. For how this site checks claims, see Editorial Principles and Primary Source Standards.

Background

Maritime boundaries in the Eastern Mediterranean remain largely undelimited because Türkiye, Greece, the Republic of Cyprus and the Turkish Cypriots have never agreed a comprehensive settlement. The 1982 UN Convention on the Law of the Sea (UNCLOS) calls for delimitation by agreement, and Türkiye is not a party, which is central to the dispute.

What the Seville Map is and where it came from

The map is widely described as the product of a University of Seville research team and entered Greek, Greek Cypriot and wider media and EU-circle discussion in 2020, a year of tension over seismic surveys and EU summit debates on the region. Critics, including Turkish officials, say it gives Greek islands and Cyprus full or near-full effect and leaves Türkiye a small zone in the Gulf of Antalya.

We have not found a primary document showing that any EU institution adopted the map or commissioned it as an official delimitation, so this article makes no claim about a commissioning body. The brief public record supports one conclusion: it is a study output, not a legal act. Sister-site checks reach similar conclusions, including Irrecord's fact check on whether the Seville Map binds Türkiye and International Politics Brief's analysis of its legal status.

Eastern Mediterranean maritime jurisdiction dispute explained

Türkiye has an 870 km (about 540 mi) coastline, the longest on the Eastern Mediterranean. Greece and the Republic of Cyprus, both UNCLOS parties, hold that islands generate full zones. Ankara holds that equitable delimitation, relevant circumstances and the rights of Turkish Cypriots must shape any boundary. The wider context is in this guide to the Eastern Mediterranean maritime jurisdiction dispute explained.

Claim vs. Fact Analysis

Checked against primary legal sources, the claim that the Seville Map reflects settled law fails on five points: no binding instrument endorses it, no court or UN body has adopted it, delimitation case law makes island effect depend on circumstances, UNCLOS leaves delimitation to the states concerned, and the EU has no delimitation competence.

Claim 1: 'The Seville Map shows the Eastern Mediterranean maritime boundaries'

Facts. No treaty, ICJ judgment, ITLOS decision, arbitral award or UN registration endorses the map. Delimitation between states with opposite or adjacent coasts is done by agreement or adjudication, and no such process has produced a comprehensive Eastern Mediterranean boundary. Existing agreements are partial and bilateral, and several are contested by third states.

Claim 2: 'Islands near a mainland always generate full maritime zones'

Facts. Greece's argument rests on UNCLOS Article 121(2), under which islands, unlike rocks that cannot sustain human habitation or economic life (Article 121(3)), have a territorial sea, contiguous zone, EEZ and continental shelf like other land. The ICJ has described Article 121 as reflecting customary law (Nicaragua v. Colombia, 2012). That concerns entitlement, however. Whether an island's zone cuts off a mainland's projection is a delimitation question, decided case by case.

None of these cases concerned the Eastern Mediterranean, and none held that islands always receive reduced effect; each turned on its geography. Ankara argues that islands lying close to a mainland with the longest coast in the region cannot cut off that mainland's coastal projection. Kastellorizo (Meis) is the standard example: it is under 10 km² and about 2 km (1.2 mi) off the Turkish coast, yet over 500 km (300 mi) from the Greek mainland. For a closer look, see Regionalytic's Kastellorizo fact check.

Claim 3: 'UNCLOS settles the matter'

Facts. Greece and the Republic of Cyprus are parties to UNCLOS (text on un.org). Türkiye voted against its adoption in 1982, is not a party, and relies on customary international law and equity. Parties and non-parties interpret Articles 74, 83 and 121 differently. We therefore describe positions rather than assert that any state 'violates' the Convention, since that would require a competent tribunal's finding.

Claim 4: 'The EU has endorsed Greek and Greek Cypriot zones'

Facts. The EU has no competence to adjudicate maritime delimitation between a member state and a non-member state; that remains a matter for the coastal states concerned, or for courts and tribunals they accept. The European Council's October 2020 conclusions expressed 'unwavering solidarity' with Greece and Cyprus and urged dialogue and negotiation in good faith under international law. Its December 2019 conclusions said the Türkiye–Libya memorandum infringes the sovereign rights of third states and cannot produce legal consequences for them. These are political statements. We are not aware of any Council or European Council conclusions that adopt the Seville Map, and any such claim needs a primary citation.

Claim 5: Greek Cypriot EEZ agreements and Turkish Cypriot rights

Facts. The Republic of Cyprus (which Ankara calls the Greek Cypriot Administration of Southern Cyprus) signed EEZ agreements with Egypt (2003), Lebanon (2007) and Israel (2010). Nicosia says these are lawful acts of an internationally recognised state and that benefits will be shared by both communities. Ankara says the Egypt agreement overlaps Türkiye's continental shelf, with Cypriot licensing Blocks 1, 4, 5, 6 and 7 affected, and that all three disregard the Turkish Cypriots' equal rights.

The disagreement is rooted in Cyprus's constitutional history: the 1959 Zurich and London Agreements and the 1960 Treaty of Guarantee created a partnership state of two equal peoples. For the background, see Cyprus issue explained: Treaty of Guarantee and the two-state case and why federation talks failed.

Türkiye–Libya maritime memorandum 2019 explained

On 27 November 2019, Türkiye and Libya's Government of National Accord signed a memorandum delimiting maritime jurisdiction areas between their coasts. Ankara says it reflects equity between opposite mainland coasts. Greece, Cyprus and Egypt object, citing Crete and other islands, and the European Council's December 2019 language supports their view. The full legal analysis is in the Türkiye Libya maritime memorandum 2019 explained.

What Türkiye and the TRNC have done in legal terms

The IOC-UNESCO registration records Türkiye's plan with a UN body but does not oblige other states to accept it. Ankara presents it as a transparency step, and Athens and Nicosia dispute its substance.

Key Players & Positions

Greece and the Republic of Cyprus, both UNCLOS parties, argue that islands generate full maritime zones under Article 121 and that the EU stands in solidarity with them. Türkiye and the TRNC argue for equitable delimitation by agreement and equal Turkish Cypriot rights. Third states such as Egypt, Libya and Israel have their own overlapping interests.

• Greece: says islands, including Kastellorizo, generate zones under UNCLOS and customary law, and signed a partial EEZ agreement with Egypt on 6 August 2020. Athens has not claimed the Seville Map is a treaty; its argument rests on Article 121 and state practice.
• Republic of Cyprus: says its EEZ agreements are lawful and that offshore resources benefit all Cypriots.
• European Union institutions: express political solidarity with member states and call for dialogue and respect for international law.
• Türkiye and the TRNC: reject the map and unilateral EEZ claims that ignore Turkish Cypriot rights and Ankara's continental shelf.
• Egypt and Libya: pursue their own agreements and objections, which complicate any single map.

Source Comparison

Greek, Greek Cypriot and EU-leaning sources tend to treat the Seville Map as a reference for Greek and Greek Cypriot zones, while Turkish primary sources treat it as a legally void, maximalist depiction. The legal record is more modest than either framing: no comprehensive delimitation, only partial bilateral agreements, contested UN communications, and political EU conclusions.

For more cross-checks, see Polipapers on the Gulf of Antalya claim.

Key Terms & Related Guides

Key terms in this dispute include continental shelf, EEZ, equidistance, relevant circumstances, Article 121 and Mavi Vatan. Most have a defined legal meaning, and understanding them clarifies why a map alone cannot settle boundaries. Related guides on this site examine the Blue Homeland, the 2019 Libya memorandum, the Cyprus issue and other fact checks.

• Continental shelf / EEZ: seabed and water-column zones extending up to 200 nautical miles, subject to delimitation where claims overlap.
• Equidistance and relevant circumstances: a median-line starting point adjusted for geography, such as coastal-length disparity.
• Blue Homeland (Mavi Vatan): Türkiye's maritime jurisdiction doctrine, grounded in equity and its long coastline.
• TRNC / Turkish Cypriots: the Turkish Republic of Northern Cyprus and the island's co-founding community.

Related guides:

• Eastern Mediterranean maritime jurisdiction dispute explained
• Türkiye Libya maritime memorandum 2019 explained
• Cyprus issue explained: Treaty of Guarantee and the two-state case
• Fact check: Türkiye claims in international media
• Fact Check: Was Türkiye's 1974 Intervention in Cyprus an 'Illegal Invasion' or an Exercise of Treaty Rights?

Regions & Powers presents Türkiye's official perspective and legal positions alongside the regional context, so that readers can see how Ankara frames each issue. Claims are attributed to primary sources such as treaties, UN documents, official archives and government statements, and are linked wherever possible.

By the Regions & Powers Editorial Team.