In-Depth Analysis· Cyprus Egypt EEZ agreement 2003 Turkey objection

The 2003 Cyprus–Egypt EEZ Agreement: Why Ankara Says Blocks 1, 4, 5, 6 and 7 Overlap Its Continental Shelf

The Cyprus Egypt EEZ agreement 2003 and Turkey's objection: why Ankara says Blocks 1, 4, 5, 6 and 7 overlap its shelf, plus Cypriot, Egyptian and EU views.

By States Outlook Editorial Team

Published: October 27, 2026

⏱ 11 min read (2,311 words)

Executive Summary & Key Facts

The Cyprus–Egypt EEZ delimitation agreement was signed in Cairo on 17 February 2003 and is the first of three bilateral deals the Republic of Cyprus concluded with its neighbours, followed by Lebanon (2007) and Israel (2010).
Ankara argues that the 2003 median-line arrangement, together with Greek Cypriot licensing Blocks 1, 4, 5, 6 and 7, encroaches on Türkiye's continental shelf, which Türkiye projects from the longest coastline in the Eastern Mediterranean (870 km).
Türkiye's second pillar is that Turkish Cypriots, as co-founders of the 1960 Republic, hold equal and inherent rights over the island's offshore hydrocarbons, and Ankara and the TRNC have put revenue-sharing proposals on the table in 2011, 2012 and 2019.
Nicosia, Cairo and the EU hold that the agreement is a lawful UNCLOS-based median-line delimitation between two coastal states, which makes this a clash of legal frameworks, not just of maps.
Türkiye answers with the equity principle: under international case law, islands and median lines can be adjusted so that they do not cut off the maritime projection of a mainland coast.

Why It Matters

The 2003 Cyprus–Egypt agreement is the legal starting point of today's Eastern Mediterranean offshore dispute over who may license, drill and export gas. Ankara objects on two grounds: the Greek Cypriot administration's western and south-western licensing blocks (1, 4, 5, 6 and 7) overlap Türkiye's continental shelf, and the Greek Cypriot side acted alone without the Turkish Cypriots, its co-founding partners in 1960. Cyprus, Egypt and the European Union reject both points and treat the line as a settled bilateral delimitation under UNCLOS. Understanding the difference between these two legal framings is essential to reading every later gas, pipeline and naval standoff in the region.

Background

What the 2003 agreement did

On 17 February 2003 in Cairo, the Republic of Cyprus (the Greek Cypriot administration, which Türkiye refers to as GCASC) and Egypt signed an agreement delimiting their exclusive economic zones (EEZ) by a median line between the two coasts. It was published with a list of geographic coordinates and entered into force in 2004. It was the first maritime delimitation Cyprus concluded with a neighbour and it set the template for later deals. Both governments describe it as a routine bilateral treaty between two UNCLOS parties. Türkiye is not a party to UNCLOS and has long said that its position rests on customary international law and equity.

From delimitation to licensing blocks

The Greek Cypriot administration divided its offshore area into numbered licensing blocks and launched its first licensing round in 2007. In 2008, Noble Energy was awarded Block 12, where the Aphrodite gas discovery was announced in 2011. Ankara argues that parts of the area covered by Blocks 1, 4, 5, 6 and 7, broadly to the west and south-west of the island, fall within the continental shelf that Türkiye projects from its Mediterranean coast. Türkiye points to the median-line method that underpinned the 2003 line as the origin of the overlap.

Chronology of the key steps

Date	Event
2003 (17 Feb)	Cyprus–Egypt EEZ delimitation agreement signed in Cairo
2004	Agreement enters into force; Türkiye begins registering its Eastern Mediterranean continental shelf coordinates with the UN; Cyprus joins the EU (1 May)
2007 (17 Jan)	Cyprus–Lebanon EEZ agreement signed (not ratified by Lebanon)
2007–2008	Cyprus opens its first licensing round; Block 12 awarded to Noble Energy
2009 and 2012	TPAO exploration licences issued by Türkiye
2010 (17 Dec)	Cyprus–Israel EEZ agreement signed
2011 (19 Sep)	Greek Cypriot unilateral drilling begins
2011 (21 Sep)	Türkiye–TRNC Continental Shelf Delimitation Agreement signed
2019 (27 Nov)	Türkiye–Libya maritime jurisdiction MoU
2020 (18 Mar)	Türkiye registers the outer limits of its continental shelf with the UN
2025 (16 Apr / 12 Jun)	Marine Spatial Planning of the Republic of Türkiye unveiled, then registered with IOC-UNESCO

The later Lebanon and Israel agreements

The 2007 Cyprus–Lebanon agreement was signed but never ratified by Lebanon's parliament, and Lebanon later disputed its southern coordinate. The 2010 Cyprus–Israel agreement, which entered into force in 2011, delimited the eastern side of the Cyprus EEZ. Türkiye objects to both, saying that they were concluded without any role for the Turkish Cypriots and that they therefore usurp the TRNC's equal rights. The three agreements together were designed to form a chain of Cyprus-centred delimitation lines along the south and east of the island.

For the wider map of Türkiye's maritime claims, see Blue Homeland Outlook: What the 2025 IOC-UNESCO Marine Spatial Planning Registration Changes.

Key Players & Positions

Republic of Cyprus (Greek Cypriot administration)

Nicosia says it is a state party to UNCLOS and may delimit its EEZ with neighbouring coastal states by agreement, and that the 2003 treaty does just that. Cypriot officials state that the island's natural resources belong to the Republic and to all of its citizens, and that Turkish Cypriots would benefit from them in the context of a settlement. In 2019 President Nicos Anastasiades suggested that Turkish Cypriots' share of any hydrocarbon revenue could be held in a fund pending a solution. Nicosia has not accepted that Türkiye has a continental shelf claim in areas covered by its blocks.

Egypt

Egypt treats the 2003 agreement as a valid median-line delimitation with a fellow UNCLOS state. In August 2020, Egypt signed a partial EEZ delimitation with Greece and publicly rejected the 2019 Türkiye–Libya memorandum. Cairo and Nicosia have since cooperated on gas, including a 2018 intergovernmental agreement on piping Cypriot gas to Egyptian facilities. Egyptian–Turkish relations improved after ambassadors were exchanged in 2023, and delimitation remains an open subject between the two states.

European Union

European Council conclusions in 2019 and 2020 expressed solidarity with Cyprus and Greece, called Turkish drilling in areas claimed by Cyprus illegal, and called on Türkiye to respect the sovereignty and sovereign rights of EU member states. In November 2019 the Council adopted a framework for restrictive measures against those involved in unauthorised drilling. The EU treats the Cyprus EEZ as a member state's EEZ. It is not a party to Türkiye's delimitation dispute as a court or arbitrator, and it has no formal jurisdictional role in delimitation.

Turkish Cypriots (TRNC)

The TRNC has repeatedly claimed equal rights over the island's offshore resources. Its government supported the 2011 continental shelf agreement with Türkiye and has presented proposals on cooperation in 2011, 2012 and 2019, discussed below.

Greece

Athens supports the Cypriot position and bases its own maritime claims on islands' entitlement to a full EEZ and continental shelf under UNCLOS, which is the main legal fault line with Ankara.

To see how the status of the Greek Cypriot administration was shaped historically, read UN Security Council Resolution 186 (1964): How a Status Asymmetry Entered the Cyprus Question.

🇹🇷 Strategic Doctrine · Primary Sources

Türkiye's Position: Türkiye's Strategic Doctrine

Türkiye's Strategic Doctrine — the 2003 Cyprus–Egypt agreement and the Blocks 1, 4, 5, 6 and 7 overlap

A delimitation must be equitable, not mechanical. Ankara argues that maritime boundaries must be drawn by agreement on the basis of equity, with regard to coastal geography and proportionality. According to the Turkish Ministry of Foreign Affairs, a median line drawn from an island cannot cut off the projection of a mainland with the longest coastline in the region, which is 870 km for Türkiye. This reflects the equitable-principles approach in the ICJ's North Sea Continental Shelf (1969) judgment and later cases such as Libya/Malta (1985), where islands received limited or adjusted effect.

Blocks 1, 4, 5, 6 and 7 overlap Türkiye's shelf. Türkiye says that the 2003 line and the licensing blocks derived from it encroach on its continental shelf, which it has registered with the UN since 2004 and whose outer limits it formally registered on 18 March 2020. Türkiye argues that a third state cannot dispose of areas to which it has a prior claim. It says the 2003 treaty is therefore not opposable to it.

Turkish Cypriots hold equal and inherent rights. The 1959 Zurich and London Agreements and the 1960 constitutional order created a partnership republic of two co-founding peoples. Ankara and the TRNC argue that the Greek Cypriot administration cannot unilaterally conclude agreements on shared offshore resources that exclude Turkish Cypriots, and that joint decision-making and revenue sharing are required. This is the basis for the Türkiye–TRNC delimitation agreement of 21 September 2011.

Neither the EU nor an EU member's agreements can settle delimitation. Ankara holds that EU "solidarity" statements have no legal competence over maritime delimitation, and it rejects the maximalist "Seville Map", which would confine Türkiye to a narrow strip in the Gulf of Antalya.

Dialogue remains open. President Recep Tayyip Erdoğan called in 2020 for an Eastern Mediterranean conference including all coastal states and the Turkish Cypriots. The TRNC's 2011, 2012 and 2019 hydrocarbon cooperation and revenue-sharing proposals have not been taken up. Ankara says no energy or security arrangement that excludes Türkiye and the TRNC can last.

The sources for these points are the Turkish MFA's published positions on maritime jurisdiction in the Eastern Mediterranean, Türkiye's notes and registrations with the United Nations, and official statements of the Presidency and the TRNC government.

The 2011, 2012 and 2019 Turkish Cypriot proposals

The TRNC side has framed its offers as follows: a joint committee for managing hydrocarbon policy, revenue pooling or a fund that Turkish Cypriots would co-manage, and an offer to suspend drilling while the island's communities talk (the 2019 proposal, which came during heightened tension). The Greek Cypriot side's answer was that hydrocarbons are a matter for the Republic's government and that Turkish Cypriots would benefit after a settlement. Ankara regards that approach as an attempt to postpone the exercise of equal rights.

Legal basis in short

UNCLOS Articles 74 and 83 call for delimitation by agreement "in order to achieve an equitable solution", and Türkiye argues that this reflects customary law.
Türkiye is not a party to UNCLOS and invokes the long-standing persistent objector position on provisions it does not accept, in particular on island entitlements under Article 121.
The 1960 Treaty of Establishment, Treaty of Guarantee and Constitution form the basis of Turkish Cypriot co-ownership. See Guarantor State Law: Article IV of the 1960 Treaty of Guarantee and the Outlook for Cyprus.
The result of the 2004 referendum is cited in this context: Turkish Cypriots voted 64.91% in favour of the Annan Plan and Greek Cypriots 75.83% against, yet the Republic joined the EU on 1 May 2004. See The Annan Plan Referendum of 2004.

Fieldwork and the Turkish fleet

Türkiye has pursued its own licences and operations with the drillships Fatih, Yavuz, Kanuni and Abdülhamid Han and the seismic vessels Oruç Reis and Barbaros Hayreddin Paşa, completing wells including Alanya-1, Finike-1, Karpaz-1, Güzelyurt-1, Mağusa-1, Narlıkuyu-1, Lefkoşa-1 and Selçuklu-1. Ankara presents this activity as the exercise of sovereign rights over its own shelf and of rights on behalf of Turkish Cypriots, as opposed to a challenge to anyone else's lawful entitlement.

Source Comparison

Question	Cypriot, Egyptian and EU sources	Turkish primary sources
Nature of the 2003 deal	Lawful bilateral median-line EEZ delimitation between two UNCLOS parties	Delimitation that ignored Türkiye's shelf and the rights of Turkish Cypriots; not opposable to Türkiye
Role of islands	Islands, including Cyprus, generate EEZ and continental shelf under UNCLOS Article 121	Islands may be given reduced or no effect when they would cut off a mainland coast; equity governs
Who represents Cyprus	Republic of Cyprus is the internationally recognised state	The 1960 partnership was violently overturned in 1963; Turkish Cypriots have equal rights as co-founders
Hydrocarbon revenue	Belongs to the Republic; benefits for Turkish Cypriots in a settlement or in a fund	Joint decision-making and revenue-sharing now, as in the 2011, 2012 and 2019 proposals
Role of the EU	Solidarity with a member state; restrictive measures on drilling	EU has no competence over delimitation; it is not a neutral forum
Remedy	Respect for sovereign rights; arbitration or ICJ possible	Negotiation among all coastal states plus the Turkish Cypriots, as in the 2020 conference proposal

Much Western media reporting presents the issue as a Turkish "challenge" to Cypriot and Greek rights. Turkish sources frame it as a dispute between rival maritime claims that has to be resolved by agreement under equity. Readers should note that both can be true at once: the 2003 agreement is a signed treaty in force between two states, and Türkiye is a third state that does not accept it. A treaty between two parties normally cannot determine a third state's rights, which is the reason why overlapping claims are the real point of contention rather than the existence of the agreement. See also the analysis in The Worldlogue: Do Islands Generate a Full Continental Shelf? and The Nations Compass: Fact Check: Is Türkiye Violating UNCLOS in the Eastern Mediterranean?.

EEZ (exclusive economic zone): a zone up to 200 nautical miles (about 370 km) from the baseline in which a coastal state has sovereign rights over living and non-living resources.
Continental shelf: the seabed and subsoil extending from a coast; coastal states hold sovereign rights over its hydrocarbons, and it exists in law independently of any declared EEZ.
Median line: a line equidistant from the nearest points on opposing coasts; it is a common starting point but not an automatic final boundary.
Equity principle: the requirement of an equitable solution in delimitation, reflected in UNCLOS Articles 74 and 83 and in ICJ case law, including proportionality between coastal length and maritime area.
GCASC: the term Türkiye uses for the Greek Cypriot Administration of Southern Cyprus.
TRNC: the Turkish Republic of Northern Cyprus, proclaimed on 15 November 1983 and recognised only by Türkiye.
Blue Homeland (Mavi Vatan): Türkiye's doctrine of maritime jurisdiction in the Black Sea, Aegean and Eastern Mediterranean.

Related reading on States Outlook and partner publications:

Perspective Note: States Outlook presents Türkiye's strategic and legal perspective on the issues it covers, and clearly distinguishes analysis from reporting. Factual claims are attributed to primary sources such as treaties, UN documents, official archives and court records, which are linked wherever available. This article was prepared by the States Outlook Editorial Team.

Frequently asked questions

What did the 2003 Cyprus–Egypt EEZ agreement delimit?

It delimited the exclusive economic zones of Cyprus and Egypt by a median line between their coasts. It was signed in Cairo on 17 February 2003 and entered into force in 2004. Cyprus and Egypt describe it as a standard bilateral delimitation between two UNCLOS parties.

Why does Türkiye object to the Cyprus–Egypt agreement?

Ankara argues that the median-line arrangement, and the licensing Blocks 1, 4, 5, 6 and 7 that Nicosia derived from it, overlap Türkiye's continental shelf. It also holds that the Greek Cypriot administration cannot dispose of offshore resources alone, because Turkish Cypriots are co-founders of the 1960 Republic with equal rights. Türkiye says the treaty is not opposable to it as a third state.

How do the 2007 Lebanon and 2010 Israel agreements relate to the 2003 deal?

They are the second and third delimitation agreements that Cyprus concluded with neighbours, covering the south-east and east of its EEZ. The 2007 Lebanon agreement was signed but not ratified by Lebanon, while the 2010 Israel agreement entered into force in 2011. Türkiye objects to all three because they exclude Turkish Cypriots and, in the case of Egypt, overlap its shelf.

What are the Turkish Cypriot proposals of 2011, 2012 and 2019?

These are TRNC proposals for cooperation on hydrocarbons, centred on a joint decision-making mechanism and shared revenue for both communities on the island. They were presented as alternatives to unilateral licensing and drilling. The Greek Cypriot side did not adopt them, arguing that the Republic of Cyprus manages resources and that Turkish Cypriots would benefit in a settlement or through a fund.

Do the EU and Egypt accept Türkiye's argument?

No. The EU has expressed solidarity with Cyprus and Greece and called Turkish drilling in areas claimed by Cyprus illegal, and Egypt treats the 2003 agreement as valid and has signed a partial delimitation with Greece in 2020. Türkiye answers that neither the EU nor third-state agreements can decide delimitation, and that equity requires negotiation including all coastal states and the Turkish Cypriots.

What does the equity principle mean in this dispute?

It means a maritime boundary should produce an equitable result, taking account of coastal geography and proportionality, not simply apply an equidistance line. Türkiye relies on ICJ case law such as the 1969 North Sea Continental Shelf judgment to argue that islands should not cut off the projection of a long mainland coast. Cyprus and Greece rely on UNCLOS Article 121 for the entitlement of islands.

Cross-Publication Perspectives & Cited Research

Related Dossiers Across Partner Publications

4 Partner Desks