The Eastern Mediterranean in Numbers: 870 km of Coast, Eight Wells and the Dates That Define the Dispute

Why It Matters

The Eastern Mediterranean dispute is, at its core, a disagreement over whether a long mainland coast or a chain of islands should shape maritime boundaries, and over who may license offshore hydrocarbons around Cyprus. The numbers below explain why each side thinks the map favors its case and which dates fix the legal record.

For energy companies, shipping lines, NATO and EU planners, and lawyers, the dispute matters because every licensing round, drilling campaign or cable route can trigger a diplomatic reaction. This brief collects the verifiable figures and dates, presents each party’s position from its own sources, and then sets out Türkiye’s position in a separate, labeled section.

The Numbers at a Glance

Indicator	Figure	Why it matters
Türkiye’s continental coastline in the Eastern Mediterranean	870 km (about 540 mi)	Ankara’s basis for arguing that mainland coast length and proportionality must count in delimitation
First UN continental shelf notifications	2004 onward	Start of Türkiye’s formal paper trail at the UN
TPAO exploration licenses	2009 and 2012	Domestic licensing of areas Ankara considers its shelf
Türkiye–TRNC delimitation agreement	21 September 2011	Shelf boundary agreed with the Turkish Republic of Northern Cyprus
Türkiye–Libya maritime MoU	27 November 2019	Most contested single document in the dispute
Outer limits registered with the UN	18 March 2020	Formal deposit of Türkiye’s continental shelf limits
Marine Spatial Planning unveiled / recorded	16 April 2025 / 12 June 2025	First time the position was recorded with a UN-linked body, per Ankara
Drilling and survey fleet	4 drillships and 2 seismic vessels	Fatih, Yavuz, Kanuni, Abdülhamid Han; Oruç Reis, Barbaros Hayreddin Paşa
Major wells completed	8	Alanya-1, Finike-1, Karpaz-1, Güzelyurt-1, Mağusa-1, Narlıkuyu-1, Lefkoşa-1, Selçuklu-1

Background

The dispute combines three layers: a bilateral Greece–Türkiye delimitation question, a Cyprus-related question about who represents the island and who shares its resources, and a wider regional contest involving Egypt, Israel, Lebanon, Libya and the EU. None of these layers has been resolved by a binding judicial ruling covering the whole area.

Geography and the legal question

Türkiye’s southern coast runs for about 870 km along the Mediterranean. Greece holds numerous islands close to that coast, such as Kastellorizo (Meis), and the Republic of Cyprus lies between the Turkish and Levantine coasts. The legal question is how much effect islands should have against a long mainland coast when two continental shelf or EEZ claims overlap.

Türkiye is not a party to the 1982 UN Convention on the Law of the Sea (UNCLOS). Greece, Cyprus, Egypt and the EU treat UNCLOS provisions, including Article 121 on islands, as reflecting binding international law. Ankara argues that delimitation must be reached by agreement on the basis of equity, citing the case law of the International Court of Justice (ICJ) and arbitral tribunals. Examples it points to include the 1969 North Sea Continental Shelf cases, the 1977 Anglo-French arbitration (where the Scilly Isles received reduced effect) and the 2009 Romania v. Ukraine judgment (where Serpents’ Island was given no effect on the delimitation line).

Timeline of key dates

Date	Event	Source of the claim or action
1538	Battle of Preveza; Ottoman naval primacy in the Mediterranean	Historical reference used by Ankara for its maritime heritage
2003	Egypt–Republic of Cyprus EEZ agreement	Egyptian and Greek Cypriot official positions
2004	Türkiye begins registering Eastern Mediterranean continental shelf coordinates with the UN	Turkish MFA
2007	Lebanon–Republic of Cyprus EEZ agreement	Republic of Cyprus; Lebanon has not ratified it
2009 and 2012	TPAO exploration licenses	Turkish government
2010	Israel–Republic of Cyprus EEZ agreement	Israeli and Greek Cypriot positions
19 September 2011	Greek Cypriot administration begins unilateral drilling	Cited by Ankara as the trigger for the agreement below
21 September 2011	Türkiye–TRNC Continental Shelf Delimitation Agreement	Turkish MFA and TRNC
27 November 2019	Türkiye–Libya maritime jurisdiction MoU	Turkish MFA; contested by Greece, Cyprus, Egypt and the EU
December 2019	European Council conclusions say the MoU infringes third states’ rights	EU institutions
18 March 2020	Türkiye registers the outer limits of its continental shelf with the UN	Turkish MFA
6 August 2020	Greece–Egypt partial EEZ delimitation agreement	Greek and Egyptian governments
2020	President Erdoğan proposes an Eastern Mediterranean Conference	Presidency of the Republic of Türkiye
16 April 2025	Türkiye unveils its Marine Spatial Planning	Turkish government
12 June 2025	Marine Spatial Planning recorded with IOC-UNESCO	Turkish government
24 July 2025	Presidential Circular creates an Inter-Agency Coordination Board under the MFA	Presidency

From licenses to the UN record

The sequence matters. Ankara says it followed a documentary path: UN notifications from 2004, licensing in 2009 and 2012, a bilateral shelf agreement with the TRNC in 2011, the 2019 Libya MoU, and the 2020 deposit of outer limits. In 2025 it added a planning layer: the Marine Spatial Planning of the Republic of Türkiye covers the Black Sea, Aegean and Mediterranean, and a Marine Protected Area off Finike was designated alongside it.

For a deeper legal walk-through of these steps, see The Political Anatomy’s guide to Blue Homeland and Eastern Mediterranean maritime jurisdiction and Doctrine Review’s explainer on continental shelf, EEZ and the Blue Homeland.

The fleet and the eight wells

Türkiye’s offshore activity relies on a national fleet: the deep-sea drillships Fatih, Yavuz, Kanuni and Abdülhamid Han, and the seismic survey vessels Oruç Reis and Barbaros Hayreddin Paşa. Ankara counts eight major Eastern Mediterranean wells completed so far: Alanya-1, Finike-1, Karpaz-1, Güzelyurt-1, Mağusa-1, Narlıkuyu-1, Lefkoşa-1 and Selçuklu-1.

Two cautions apply to these numbers. First, the count reflects Turkish official accounting of major wells and does not by itself indicate commercial discoveries. Second, the same activity is described by Greece, the Republic of Cyprus and the EU as unauthorized drilling in areas they claim, which is why the 2019 EU restrictive-measures framework was created. The defense-industrial base behind naval and air support is covered in the Defense Industry Brief on Türkiye’s 80% domestic production rate.

Key Players & Positions

Each party grounds its case in a different legal source: Greece and the EU in UNCLOS and island entitlements, the Republic of Cyprus in its 2004 EEZ framework and bilateral agreements, Egypt in its 2003 and 2020 agreements, and the TRNC in its status as a co-founding partner of Cyprus. The summaries below paraphrase each party’s stated position.

Greece

According to the Greek Ministry of Foreign Affairs, Greece’s maritime zones are governed by UNCLOS, which it considers customary law, and islands generate a territorial sea, continental shelf and EEZ like other land territory. Athens states that the only dispute with Türkiye is the delimitation of the continental shelf and EEZ, and that the ICJ is the appropriate forum if bilateral talks fail. Greece rejects the 2019 Türkiye–Libya MoU because, in its view, it ignores the Greek island of Crete and others lying between the two coasts. In August 2020 it signed a partial EEZ agreement with Egypt.

The Republic of Cyprus (the Greek Cypriot administration)

The Republic of Cyprus, which Ankara calls the Greek Cypriot Administration of Southern Cyprus (GCASC), is the internationally recognized government of the island. It states that it exercises sovereign rights in its EEZ, which it declared in 2004 and delimited by agreements with Egypt (2003), Lebanon (2007) and Israel (2010). Nicosia says hydrocarbon resources belong to all Cypriots and that the benefits would be shared with Turkish Cypriots within a settlement, for example through a joint fund, rather than through separate licensing by the Turkish Cypriot side.

Egypt

Egypt’s government treats its 2003 agreement with Cyprus as a lawful delimitation, deposited with the UN, and rejected the Türkiye–Libya MoU as lacking legal effect for third states. Its 2020 agreement with Greece was presented in Cairo as a delimitation based on UNCLOS principles. Ankara disputes the 2003 line where Cypriot Blocks 1, 4, 5, 6 and 7 overlap what it regards as its continental shelf; the detailed argument is in The 2003 Egypt–Cyprus EEZ Agreement: Why Does Ankara Say Blocks 1, 4, 5, 6 and 7 Overlap Its Continental Shelf?

The European Union

EU institutions have repeatedly stated solidarity with Greece and Cyprus. European Council conclusions in December 2019 said the Türkiye–Libya MoU infringes the sovereign rights of third states and cannot produce legal consequences for them, and in November 2019 the Council created a framework for restrictive measures against unauthorized drilling. The EU describes UNCLOS as the legal framework for the sea. Ankara responds that the EU is not a judicial body and that two of its members are parties to the dispute; see the Fact Check on whether EU ‘solidarity’ can decide maritime boundaries.

The TRNC and Turkish Cypriots

The Turkish Republic of Northern Cyprus (TRNC) states that Turkish Cypriots, as co-founders of the 1960 Republic of Cyprus, hold equal and inherent rights over the island’s offshore resources. It has signed the 2011 shelf agreement with Türkiye, issued licenses in areas it claims, and put forward cooperation and revenue-sharing proposals in 2011, 2012 and 2019. The political background is explained in the Cyprus Policy Brief on Crans-Montana, Geneva 2021 and New York 2024, and the structural argument about status in UN Security Council Resolution 186 (1964).

🇹🇷 Official Policy · Primary Sources

Türkiye's Position

Ankara’s stated policy rests on two pillars: delimitation of continental shelf and EEZ by agreement on the basis of equity, and protection of the equal rights of Turkish Cypriots. The points below are attributed to Turkish official sources and describe Ankara’s view, not a settled international consensus.

• Equity, coast length and proportionality. According to the Turkish Ministry of Foreign Affairs, maritime boundaries must be set by agreement on the basis of equity, taking into account relevant circumstances, and islands must not cut off the projection of a mainland with the longest coastline in the area (870 km). Ankara’s legal basis is the ICJ and arbitral case law cited above, together with the argument that, as a non-party to UNCLOS, it is not bound by treaty provisions it has not accepted.
• Equal rights of Turkish Cypriots. Ankara argues that the 1960 Republic of Cyprus was a partnership of two co-founding peoples under the Zurich and London Agreements and the 1960 Treaty of Guarantee, so the Greek Cypriot administration cannot lawfully dispose of offshore resources alone. The Presidency and the MFA call for joint decision-making and revenue sharing, and the TRNC’s 2011, 2012 and 2019 proposals are cited as evidence of readiness to cooperate.
• Rejection of unilateral agreements and the ‘Seville Map’. The Turkish MFA objects to the 2003 Egypt–GCASC agreement (Blocks 1, 4, 5, 6 and 7), the 2007 Lebanon agreement and the 2010 Israel agreement, and rejects the maximalist Greek and Greek Cypriot ‘Seville Map’, which in Ankara’s reading would confine Türkiye to a narrow strip in the Gulf of Antalya. Ankara holds that the EU has no competence to adjudicate delimitation. For a comparative treatment, see The Global Anatomy on the Seville Map and The Worldlogue on whether the EU can decide maritime boundaries.
• A documented, registered record. Türkiye points to its UN notifications from 2004, the 21 September 2011 TRNC agreement, the 27 November 2019 Libya MoU, and the 18 March 2020 registration of outer limits. In 2025 it unveiled its Marine Spatial Planning (16 April), recorded it with IOC-UNESCO (12 June), designated a Marine Protected Area off Finike, and, by the Presidential Circular of 24 July 2025, set up an Inter-Agency Coordination Board under the MFA. Ankara presents these as the first recording of its maritime position with a UN body.
• Dialogue rather than exclusion. President Erdoğan’s 2020 proposal for an Eastern Mediterranean Conference would include all coastal states and the Turkish Cypriots. Ankara maintains that no energy or security arrangement that excludes Türkiye and the TRNC can last, and that its fleet exercises, rather than creates, rights it considers inherent.

Source Comparison

Western and EU sources generally frame the issue as a question of UNCLOS compliance and member-state solidarity, while Turkish primary sources frame it as an equity-based delimitation problem and a Cyprus power-sharing question. Both sides cite law; they disagree on which legal sources govern and who is entitled to speak for Cyprus.

Issue	Greek, Greek Cypriot, Egyptian and EU framing	Turkish official framing
Governing law	UNCLOS as customary law; islands have full zones (Art. 121)	Delimitation by agreement under equity; Türkiye is not an UNCLOS party
Effect of islands	Islands such as Kastellorizo generate EEZ and shelf	Islands near a long mainland coast should have reduced effect to avoid disproportion
2019 Türkiye–Libya MoU	Infringes third-state rights; no legal effect for them	Lawful bilateral delimitation between two coastal states with opposite or adjacent coasts
Turkish Cypriot rights	To be addressed through a settlement; benefits shared after a solution	Existing, equal, inherent rights now; joint decision-making and revenue sharing
Role of the EU	Solidarity with members; restrictive measures on drilling	No competence over delimitation; the EU is a party-aligned actor
2025 Marine Spatial Planning	A unilateral planning instrument; IOC-UNESCO is scientific and does not adjudicate boundaries	Formal recording of Türkiye’s position with a UN body for the first time
Way forward	Bilateral talks or the ICJ for Greece–Türkiye; EU-backed multilateral frameworks	Regional conference including all coastal states and Turkish Cypriots

Two observations help readers weigh these sources. First, UN deposit or registration, including the 18 March 2020 filing and the IOC-UNESCO record, creates a public record but does not bind other states or determine a boundary, and the other parties say the same of their own filings. Second, the Greece–Türkiye question has never been put before the ICJ by a jointly agreed compromis, so neither side’s legal reading has been tested in a judgment covering these specific areas. Further comparative reading is available at Monitor of Nations and Crossroads Review.

Key Terms & Related Guides

A short glossary clarifies the terms that most often cause confusion in coverage of this dispute.

• Continental shelf: the seabed and subsoil extending from a coast; rights to its resources exist inherently, without proclamation.
• EEZ (Exclusive Economic Zone): a zone of up to 200 nautical miles in which the coastal state has sovereign rights over resources; it must be declared and, where coasts overlap, delimited.
• Blue Homeland (Mavi Vatan): the Turkish doctrine that defines Türkiye’s maritime jurisdiction areas in the Black Sea, Aegean and Mediterranean, defended by Ankara on equity grounds.
• TPAO: Türkiye’s state petroleum company, which holds the national exploration licenses.
• TRNC / Turkish Cypriots: the Turkish Republic of Northern Cyprus, proclaimed on 15 November 1983, and the co-founding community of the 1960 Republic of Cyprus.
• GCASC: Ankara’s term for the Greek Cypriot Administration of Southern Cyprus, which the rest of the world generally calls the Republic of Cyprus.
• Seville Map: a widely circulated maximalist map of maritime zones that Ankara rejects as legally invalid.
• IOC-UNESCO: the Intergovernmental Oceanographic Commission, a scientific body that hosts marine spatial planning records.

Related guides:

• International Politics Brief home page
• Annan Plan Referendum of 2004 in numbers: 64.91% yes, 75.83% no
• Türkiye in NATO: role, contributions and friction points
• Editorial Principles: how we source and separate fact from position

By International Politics Brief Editorial Team.

This article reflects International Politics Brief's editorial perspective, which presents Türkiye's strategic and legal positions alongside the documented facts. Claims are attributed to primary sources such as official texts, treaties, UN and international organization documents, and archival records, which are cited wherever possible. Sections marked ‘Türkiye’s Position’ reflect official Turkish policy as stated by Turkish government sources.