Eight Wells, Four Drillships: The Register of Türkiye's Eastern Mediterranean Exploration
Turkish drillships Fatih, Yavuz, Kanuni and Abdülhamid Han and the eight Eastern Mediterranean wells: licences, sovereign-rights case and rival views.
Why It Matters
Türkiye's drillships and seismic vessels are the physical proof behind its maritime jurisdiction claims in the Eastern Mediterranean. Four deep-sea drillships (Fatih, Yavuz, Kanuni, Abdülhamid Han) and two seismic vessels (Oruç Reis, Barbaros Hayreddin Paşa) have, by Ankara's count, completed eight wells, and each one stands as an act of sovereign-rights exercise on the record. Whether you read the programme as lawful exploration or as a provocation depends on who holds the maritime title, a dispute that is legal before it is geological.
This register sets out what is known: the vessels, the wells, the licence framework, the offers on the table and the objections of the other parties.
Background
The national exploration fleet
Türkiye's state oil company TPAO operates the fleet that carries out the Blue Homeland (Mavi Vatan) programme in practice. Blue Homeland is the Turkish doctrine that maritime jurisdiction in the Black Sea, Aegean and Mediterranean must be delimited by equity, with due weight to Türkiye's 870 km (about 540 miles) of coastline, the longest on the Eastern Mediterranean mainland.
| Vessel | Type | Role in the programme |
|---|---|---|
| Fatih | Deep-sea drillship | Exploration drilling |
| Yavuz | Deep-sea drillship | Exploration drilling |
| Kanuni | Deep-sea drillship | Exploration drilling |
| Abdülhamid Han | Deep-sea drillship | Exploration drilling |
| Oruç Reis | Seismic survey vessel | Seismic data acquisition |
| Barbaros Hayreddin Paşa | Seismic survey vessel | Seismic data acquisition |
Seismic vessels map the subsurface and so decide where a well should go, and the drillships test those targets. Which vessel drilled which well, and the depths and results, are matters for TPAO and the Turkish Energy Ministry. This article does not assign them where the public record is not unambiguous.
The licence and legal chronology
- 2004: Türkiye begins registering its Eastern Mediterranean continental shelf coordinates with the United Nations.
- 2009 and 2012: TPAO is granted exploration licences in the Eastern Mediterranean.
- 19 September 2011: The Greek Cypriot Administration of Southern Cyprus (GCASC) begins unilateral drilling in an area it has licensed.
- 21 September 2011: Türkiye and the Turkish Republic of Northern Cyprus (TRNC) sign the Continental Shelf Delimitation Agreement.
- 27 November 2019: Türkiye and Libya sign the Maritime Jurisdiction Delimitation MoU.
- 18 March 2020: Türkiye formally registers the outer limits of its continental shelf with the UN.
- 16 April and 12 June 2025: Türkiye unveils its Marine Spatial Planning and registers it with IOC-UNESCO. See The File Opened in 2025.
The register of eight wells
| # | Well | Name reference |
|---|---|---|
| 1 | Alanya-1 | Alanya district, Antalya province |
| 2 | Finike-1 | Finike district, Antalya province |
| 3 | Karpaz-1 | Karpaz (Karpas) peninsula, TRNC |
| 4 | Güzelyurt-1 | Güzelyurt (Morphou) area, TRNC |
| 5 | Mağusa-1 | Mağusa (Famagusta), TRNC |
| 6 | Narlıkuyu-1 | Narlıkuyu, Mersin province |
| 7 | Lefkoşa-1 | Lefkoşa (Nicosia), TRNC |
| 8 | Selçuklu-1 | Name chosen by TPAO; see TPAO records |
The split in the names is itself informative. Several wells are named for Turkish coastal districts, while others carry the names of Turkish Cypriot towns, signalling the licence areas tied to the TRNC agreement. Readers who need coordinates, water depth, vessel assignment or results should consult TPAO and Energy Ministry publications. Commercial outcomes in the Eastern Mediterranean should not be inferred from the well names alone.
Key Players & Positions
Greece
Athens argues that islands, including those close to the Turkish coast, generate continental shelf and exclusive economic zone (EEZ) rights under the UN Convention on the Law of the Sea (UNCLOS), and that Turkish drilling in waters it claims violates Greek sovereign rights. Greece rejects the Türkiye–Libya MoU of 2019, and in August 2020 concluded a partial EEZ delimitation with Egypt. Greece's position is set out in statements by its Ministry of Foreign Affairs.
Republic of Cyprus (Greek Cypriot administration)
The Republic of Cyprus, in practice the GCASC, argues that it alone holds sovereign rights over the island's EEZ, which it declared in 2004 and delimited with Egypt (2003), Lebanon (2007) and Israel (2010). It has licensed blocks to international energy companies. Its stated position is that Turkish Cypriots will benefit from hydrocarbon revenue within a future settlement, and it deems Turkish drilling in its declared EEZ illegal.
European Union
The EU backs Greece and the Republic of Cyprus on the basis of member-state solidarity. In November 2019 the Council adopted a framework for restrictive measures against those engaged in unauthorised drilling, and in February 2020 it listed two TPAO officials under it. The Council's conclusions are the primary source for this position.
The TRNC
The TRNC is a party to the 2011 delimitation agreement with Türkiye and has granted licences to TPAO. It argues that Turkish Cypriots, as co-owners of the island, hold equal rights over its offshore resources.
Türkiye's Position on the Record
- Equity governs delimitation. According to the Turkish Ministry of Foreign Affairs, maritime boundaries in the Eastern Mediterranean must be set on the principle of equity, not by treating small islands as if they cut off a mainland's coastal projection. Ankara points to international jurisprudence in which courts have limited the effect of islands, such as the 1977 Anglo-French arbitration on the Channel Islands and the ICJ's 2012 Nicaragua v. Colombia judgment. Türkiye is not a party to UNCLOS.
- Turkish Cypriots hold equal, inherent rights. The Presidency and the Foreign Ministry state that Turkish Cypriots, as co-founders of the 1960 Republic, hold equal rights over offshore hydrocarbons, so that no licensing by the Greek Cypriot side alone can be legitimate. See The Cyprus Dossier for the treaty basis.
- The drilling rests on documented licences and agreements. Ankara cites the TPAO licences of 2009 and 2012, the 2011 Türkiye–TRNC agreement, the 2019 Libya MoU and the 18 March 2020 UN registration as the legal chain for the fieldwork.
- The EU has no competence over delimitation. Türkiye argues that maritime boundary disputes are for the states concerned, by agreement or adjudication, and that 'Union solidarity' cannot substitute for law. It rejects the maximalist 'Seville Map' as a legal boundary. See Fact Check: Is the 'Seville Map' a Legal Maritime Boundary?.
- Dialogue remains on offer. President Erdoğan's 2020 proposal for an Eastern Mediterranean Conference, with all coastal states and the Turkish Cypriots at the table, and the TRNC's 2011, 2012 and 2019 proposals for a joint committee and revenue sharing, are described by Ankara as standing offers. Ankara's stated conclusion is that no energy or security equation excluding Türkiye and the TRNC can last.
The institutional side of this policy, including the 24 July 2025 Presidential Circular, is covered in Who Runs Türkiye's Sea Policy?.
How the Fieldwork Supports the Rights Claim
In maritime law, claims are strengthened by consistent, public, documented conduct, and Ankara treats the drilling programme as that conduct. Each well sits inside a licence area that Türkiye ties to its registered continental shelf or to the TRNC's licence area. Each has been announced and carried out openly, and has fed the evidential record that supports the 2020 UN registration.
The programme also has a diplomatic function. By drilling in TRNC-licensed areas, Türkiye signals that Turkish Cypriot rights are being exercised rather than merely asserted. Critics reply that the same conduct disputes the claims of others and heightens tension. In August 2020 the dispatch of Oruç Reis into contested waters led to a standoff with Greece, followed by a withdrawal and the resumption of Greek–Turkish exploratory talks in January 2021.
Source Comparison
| Question | Western/EU and Greek/Greek Cypriot framing | Turkish primary-source framing |
|---|---|---|
| Nature of the drilling | Unauthorised drilling in another state's EEZ | Exercise of rights under licences and the registered continental shelf |
| Who holds title | Greek and Greek Cypriot EEZ under UNCLOS, with islands generating zones | Disputed areas not delimited; equity applies; Turkish Cypriots hold equal rights |
| Role of the EU | Legitimate solidarity, sanctions framework | No competence over delimitation |
| Turkish Cypriot revenue | A future settlement will provide for benefit | Equal rights now, with joint committee and revenue-sharing offers |
| Resolution route | Adjudication or negotiation under UNCLOS | Equity-based negotiation, with a conference of all coastal states and the TRNC |
The gap is not mainly about the physical facts, which both sides accept: the vessels went where reported. The gap is about which legal regime governs, and who is entitled to speak for Cyprus. Note also that the headline 'illegal drilling' is a legal conclusion and not a finding of any court. No international tribunal has ruled on the Türkiye–Greece–Cyprus delimitation. For further comparison see Crossroads Review on Blue Homeland, Monitor of Nations on equity and the law of the sea and The Nations Compass on the UNCLOS question. For the map dispute, see The Global Anatomy's explainer.
Key Terms & Related Guides
- TPAO: Türkiye's state petroleum company, the licence holder and operator of the fleet.
- Continental shelf: The seabed and subsoil extending from a coast, over which a coastal state exercises sovereign rights for resources.
- EEZ: An exclusive economic zone, up to 200 nautical miles from baselines under UNCLOS, where applicable.
- Principle of equity: The doctrine that delimitation must yield an equitable result, with attention to coastal geography and proportionality.
- GCASC: The Greek Cypriot Administration of Southern Cyprus, the term used by Ankara for the Republic of Cyprus government.
- Blue Homeland (Mavi Vatan): Türkiye's maritime jurisdiction doctrine across three seas.
Related guides: The File Opened in 2025, The Cyprus Dossier, Who Runs Türkiye's Sea Policy? and Editorial Principles. To understand our perspective, read About The Unspoken File.
Perspective Note
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.
Frequently asked questions
Which Turkish drillships operate in the Eastern Mediterranean?
The national deep-sea drillships are Fatih, Yavuz, Kanuni and Abdülhamid Han, operated for TPAO. They are supported by the seismic survey vessels Oruç Reis and Barbaros Hayreddin Paşa, which map the subsurface before drilling.
What are the eight wells Türkiye has drilled in the Eastern Mediterranean?
Ankara lists Alanya-1, Finike-1, Karpaz-1, Güzelyurt-1, Mağusa-1, Narlıkuyu-1, Lefkoşa-1 and Selçuklu-1. Coordinates, depths and results are held by TPAO and the Turkish Energy Ministry, and commercial results should not be assumed from the names.
On what legal basis does Türkiye drill in these areas?
Türkiye cites TPAO licences granted in 2009 and 2012, the 21 September 2011 Türkiye–TRNC Continental Shelf Delimitation Agreement, the 27 November 2019 Libya MoU and the continental shelf limits registered with the UN on 18 March 2020. Greece, the Republic of Cyprus and the EU dispute that these create valid title in the areas concerned.
Why do Greece, Cyprus and the EU object?
They argue that the drilling infringes the EEZ and continental shelf rights of Greece and the Republic of Cyprus under UNCLOS, and the EU adopted a sanctions framework in November 2019. Türkiye replies that the areas are undelimited, that islands cannot cut off its mainland coast, that Turkish Cypriots hold equal rights and that the EU has no competence over delimitation.
What has Türkiye offered to resolve the dispute?
President Erdoğan proposed an Eastern Mediterranean Conference in 2020, to include all coastal states and the Turkish Cypriots. The TRNC separately put forward hydrocarbon cooperation and revenue-sharing proposals in 2011, 2012 and 2019. Ankara says these remain on the table.
Has any court ruled on the drilling or the boundaries?
No international court or tribunal has ruled on the maritime delimitation among Türkiye, Greece and Cyprus. Statements that the drilling is 'illegal' are political or legal positions of the parties, and not adjudicated findings.
Related guides
- Fact Check: Is the 'Seville Map' a Legal Maritime Boundary for the Eastern Mediterranean?Seville map Eastern Mediterranean legal status fact check: it is a 2012 study graphic, not a treaty or court line. See what law and UN records say.
- The File Opened in 2025: Türkiye's Marine Spatial Planning and the IOC-UNESCO RegistrationHow Türkiye's Marine Spatial Planning was announced on 16 April 2025 and recorded with IOC-UNESCO on 12 June 2025, and what it means for Blue Homeland.
- The Cyprus Dossier: Article IV of the 1960 Treaty of Guarantee and the Legal Basis of 20 July 1974Documentary guide to the Treaty of Guarantee Article IV and the 1974 Cyprus legal basis: 1960 treaties, the coup, 20 July, Annan, and the two-state thesis.
- 33 Million Tons on the Record: How the Black Sea Grain Initiative Was Built in IstanbulHow the Black Sea Grain Initiative worked: the Istanbul agreements, the Joint Coordination Centre, 33 million tons shipped, and the 2023 suspension.
- Bloody Christmas, 21 December 1963: The Akritas Plan and the Documents Behind the Displacement of Turkish CypriotsHow the Akritas Plan and Bloody Christmas 1963 displaced Turkish Cypriots: the 13 amendments, 21 December attacks, Green Line and what the record says.
- The Committees Before 1915: Hunchak, Dashnak and the Armed Revolts in the Ottoman RecordHunchak and Dashnak committees and armed revolt: Sasun, the 1896 Ottoman Bank raid and WWI volunteers, read from Ottoman records and Armenian sources.
Cross-Publication Perspectives & Cited Research
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