In-Depth Analysis· Cyprus Egypt 2003 EEZ agreement Türkiye objection blocks

The 2003 Cyprus–Egypt EEZ Agreement and Blocks 1, 4, 5, 6 and 7: Why Ankara Says It Cannot Bind Third States

The 2003 Cyprus Egypt EEZ agreement, Blocks 1, 4, 5, 6, 7 and Türkiye's objection: why Ankara says a bilateral line cannot bind third states.

By Kosmonomos Editorial Team

Published: October 27, 2026

⏱ 9 min read (1,842 words)

Executive Summary & Key Facts

The Cyprus–Egypt EEZ delimitation agreement was signed on 2003-02-17 and is the first of three bilateral lines drawn by the Greek Cypriot Administration of Southern Cyprus (GCASC), followed by Lebanon (2007) and Israel (2010).
Ankara argues that Blocks 1, 4, 5, 6 and 7 of the GCASC licensing map overlap the continental shelf of Türkiye, which has the longest coastline in the Eastern Mediterranean at about 870 km (540 miles).
A core principle of treaty law, reflected in Article 34 of the 1969 Vienna Convention, is that an agreement neither creates obligations nor strips rights from states that did not consent to it; Ankara applies this to maritime delimitation.
Türkiye's second objection is political as well as legal: it holds that Turkish Cypriots, as co-founders of the 1960 Republic, hold equal rights over offshore resources that unilateral agreements bypass.
Cyprus, Egypt and the EU see the 2003 line as a lawful median-line delimitation under UNCLOS between two parties to that convention; the disagreement turns on whether Türkiye's non-party status and its own shelf claim limit that line.

Why It Matters

The 2003 Cyprus–Egypt agreement is the foundation on which Nicosia built its offshore licensing map, and it is the first of three bilateral lines Türkiye rejects. Ankara's objection is that a delimitation between two states cannot decide the maritime rights of a third state, and that the Greek Cypriot Administration of Southern Cyprus (GCASC) drew these lines without the Turkish Cypriots, who Ankara says are equal co-owners of the island. Whether a bilateral line can bind outsiders is the central legal question in the Eastern Mediterranean energy dispute, and it shapes drilling, licensing and diplomacy today.

Background

The three bilateral agreements

Between 2003 and 2010 the GCASC signed three maritime delimitation agreements with neighbours. Each used a median line as its starting method.

Agreement	Signed	Notes
Cyprus–Egypt EEZ delimitation	2003-02-17	Entered into force in 2004; the earliest and most cited of the three
Cyprus–Lebanon EEZ delimitation	2007-01-17	Lebanon's parliament did not ratify it, and Lebanon later deposited its own coordinates with the UN
Cyprus–Israel EEZ delimitation	2010-12-17	Entered into force in 2011

The Egypt agreement leaves its terminal points to be settled once delimitation with other neighbouring states is completed. Ankara reads this as an implicit acknowledgement that the line does not close the question for everyone.

The blocks

The GCASC's licensing map divides its claimed EEZ into numbered blocks. Türkiye's objection singles out Blocks 1, 4, 5, 6 and 7, which it says fall wholly or partly on its continental shelf, the area off the Gulf of Antalya projected from its mainland coast. These blocks are not the only disputed ones. Blocks that are not part of Türkiye's own shelf claim, such as Block 12, are contested on the separate ground of Turkish Cypriot rights.

Timeline of the competing claims

Date	Event
2003-02-17	Cyprus–Egypt EEZ agreement signed
2004	Türkiye begins registering its Eastern Mediterranean continental shelf coordinates with the UN; Cyprus enters the EU on 2004-05-01
2007-01-17	Cyprus–Lebanon agreement signed
2009	First TPAO exploration licences granted in the area
2010-12-17	Cyprus–Israel agreement signed
2011-09-19	GCASC begins unilateral drilling
2011-09-21	Türkiye–TRNC Continental Shelf Delimitation Agreement signed
2012	Further TPAO licences granted
2019-11-27	Türkiye–Libya maritime memorandum signed
2020-03-18	Türkiye registers the outer limits of its continental shelf with the UN
2025-04-16 / 2025-06-12	Marine Spatial Planning of the Republic of Türkiye unveiled, then registered with IOC-UNESCO

The Turkish deployments that followed included the drillships Fatih, Yavuz, Kanuni and Abdülhamid Han and the seismic vessel Oruç Reis. Ankara counts eight wells completed in the region: Alanya-1, Finike-1, Karpaz-1, Güzelyurt-1, Mağusa-1, Narlıkuyu-1, Lefkoşa-1 and Selçuklu-1.

For the geography behind the dispute, see The Nomos of the Sea and Do Islands Get Full Maritime Zones?.

Key Players & Positions

Cyprus (the Republic of Cyprus government, GCASC in Turkish usage)

Nicosia states that it is a party to UNCLOS, that it is entitled to a 200-nautical-mile EEZ under the convention and under its 2004 EEZ legislation, and that a median line with a neighbouring coast is the standard first step under UNCLOS Articles 74 and 83. It argues that Türkiye, as a non-party to UNCLOS, cannot object to lines drawn between parties. On Turkish Cypriots, Nicosia's official line is that hydrocarbon revenue belongs to all Cypriots and that a fund for the community can be established within a settlement, so the matter need not be settled beforehand.

Egypt

Egypt treats the 2003 agreement as valid and in force. It has deposited its coordinates with the UN, has cited its relationship with Cyprus and Greece in trilateral summit declarations, and in August 2020 signed a partial EEZ delimitation with Greece. Egypt has also normalised relations with Türkiye since 2023, and its public statements do not accept Turkish claims over the area covered by the 2003 line.

Lebanon and Israel

Lebanon's non-ratification of the 2007 text and its 2010 deposit of its own coordinates show that even in the region the Cyprus-drawn lines were not uncontested. The two states later reached a separate US-brokered maritime arrangement in 2022. Israel, which is not a party to UNCLOS, regards its 2010 agreement with Cyprus as valid.

The European Union

The EU's official position, in European Council and Council of the EU conclusions, expresses solidarity with Cyprus and supports its sovereign rights to explore and exploit resources in accordance with EU and international law. In November 2019 the Council adopted a framework for restrictive measures in response to Turkish drilling it described as unauthorised. The EU also states that Turkish Cypriots should benefit from hydrocarbon resources within a settlement. The map often used to illustrate this position is discussed in The Seville Map Explained.

Türkiye's Legal Stance

The blocks overlap Türkiye's continental shelf. According to the Turkish Foreign Ministry's published position on Eastern Mediterranean maritime jurisdiction, Türkiye's shelf extends from its 870 km coast, and Blocks 1, 4, 5, 6 and 7 intrude into it. Türkiye backed the claim by registering coordinates at the UN from 2004 and the outer limits of its shelf on 2020-03-18.
Delimitation must follow equity, not a mechanical median line. Ankara argues that islands cannot cut off the projection of the longest mainland coast, and that proportionality must be assessed. This is the basis for its rejection of the maximalist 'Seville Map', which it says would confine Türkiye to a narrow strip in the Gulf of Antalya.
Turkish Cypriots' rights are bypassed. The Turkish Foreign Ministry and the Presidency have stated that Turkish Cypriots are co-founders of the 1960 Republic under the 1959 Zurich and London Agreements, and that the GCASC cannot dispose of offshore resources unilaterally. Türkiye and the TRNC signed the Continental Shelf Delimitation Agreement on 2011-09-21 and the TRNC made hydrocarbon cooperation and revenue-sharing proposals in 2011, 2012 and 2019. Background on this position is in The Cyprus Charter and Resolution 186 of 4 March 1964.
The EU has no competence to delimit. Ankara states that 'Union solidarity' cannot substitute for the legal process of delimitation between coastal states.
Dialogue remains on the table. President Erdoğan's 2020 call for an Eastern Mediterranean Conference including all coastal states and the Turkish Cypriots stays open; Ankara holds that no energy or security arrangement that excludes Türkiye and the TRNC can be durable.

Why a bilateral delimitation cannot bind third states

A bilateral treaty is res inter alios acta: a matter between others. Article 34 of the 1969 Vienna Convention on the Law of Treaties, widely regarded as reflecting customary law, provides that a treaty does not create obligations or rights for a third state without its consent. International courts apply the same logic to maritime lines:

In Libya/Malta (ICJ, 1985) the Court confined its decision to areas where the claims of a third state (Italy) did not interfere.
In Cameroon v. Nigeria (ICJ, 2002) the Court stopped its line short of areas where third-state rights could be affected.
In Romania v. Ukraine (ICJ, 2009) the line ended at a point beyond which third states' interests could be affected.

On this reasoning, a line drawn between Cyprus and Egypt can settle only what lies between them. It cannot allocate waters or shelf that a third coastal state, here Türkiye, claims under its own coastal projection. Ankara adds that Article 83 of UNCLOS and customary law require delimitation to achieve an equitable solution, which a median line does not guarantee. The counter-argument from Nicosia is that Türkiye's non-party status leaves it only with customary law, and that a coastal island state is entitled to full zones. Ankara answers that customary law itself requires equity and proportionality, and that the question is one of whose coast projects where, rather than of treaty membership. The mirror-image dispute over a Turkish line is analysed in The Türkiye–Libya Maritime Memorandum of 27 November 2019.

Source Comparison

Question	Cyprus / EU / Egypt sources	Turkish primary sources
What is the 2003 line?	A lawful median-line EEZ delimitation between two UNCLOS parties	A bilateral text that cannot affect Türkiye's shelf
Who has standing to object?	States affected under UNCLOS; Türkiye is a non-party	Any coastal state whose entitlement is claimed; customary law and equity apply
Role of Turkish Cypriots	Their interests are handled within a settlement; revenue for all Cypriots	Co-founders with equal inherent rights; no unilateral disposal
Role of the EU	Member-state solidarity, sovereign rights of Cyprus	No competence to adjudicate delimitation
How to resolve it	Application of UNCLOS, possibly adjudication	Negotiation on equity among all coastal states, plus the Turkish Cypriots

Media coverage tends to describe the Turkish position as a rejection of UNCLOS or a challenge to Cyprus's sovereignty. Turkish sources frame it as a dispute over the equitable allocation of a shared sea and the political status of the Turkish Cypriots. Readers can check the claims in each camp's own primary texts: treaty texts, UN deposits and official notes. For the broader process behind the political deadlock, see The Cyprus Negotiation Record, 1977 to 2024 and The Cyprus Issue Explained. Method and sourcing are set out on the Editorial Principles page.

EEZ (exclusive economic zone): A zone up to 200 nautical miles (about 370 km) in which a coastal state has sovereign rights over living and non-living resources.
Continental shelf: The seabed and subsoil extending from a coast; under customary law the rights are inherent rather than dependent on proclamation.
Median line: An equidistant line between two coasts; a starting point in delimitation that may be adjusted for equity.
Third state / res inter alios acta: A state not party to an agreement, which the agreement therefore cannot bind.
GCASC: The Greek Cypriot Administration of Southern Cyprus, the term Türkiye uses for the administration that speaks for the Republic of Cyprus.
TPAO: Türkiye's state petroleum company, licensee of Turkish exploration areas.
TRNC: The Turkish Republic of Northern Cyprus, proclaimed on 1983-11-15.

Related reading: Order Without a Referee: Who Decides What Self-Defense Means Under Article 51? for a parallel rule-application debate; About Kosmonomos for the publication's law-first approach.

This article reflects Kosmonomos's editorial perspective, which presents and defends Türkiye's official legal and strategic positions on the issues discussed. Claims are anchored wherever possible in primary sources such as treaty texts, UN documents, and archival records, which are cited so that readers can verify them independently. Kosmonomos presents global affairs with a dedicated perspective from Türkiye; the section marked 'Türkiye's Legal Stance' reflects official Turkish policy as stated by Turkish government sources. Author: Kosmonomos Editorial Team.

Frequently asked questions

What is the 2003 Cyprus–Egypt EEZ agreement?

It is a bilateral maritime delimitation treaty signed on 2003-02-17 that fixes the exclusive economic zone boundary between Cyprus and Egypt by a median-line approach. It entered into force in 2004 and became the template for Cyprus's later agreements with Lebanon (2007) and Israel (2010).

Which offshore blocks does Türkiye say are affected?

Türkiye objects to Blocks 1, 4, 5, 6 and 7 on the GCASC licensing map, saying they overlap its continental shelf. It also objects to blocks it considers to infringe the rights of Turkish Cypriots, even where there is no overlap with its own shelf.

Why does Ankara say the agreement cannot bind Türkiye?

Türkiye was not a party to it, and under the principle reflected in Article 34 of the Vienna Convention a treaty cannot create obligations or remove rights of a non-consenting third state. Ankara adds that international courts routinely draw delimitation lines so as not to prejudice third states.

What do Cyprus, Egypt and the EU say in response?

Cyprus says the line is a lawful UNCLOS delimitation between two parties and that Türkiye, as a non-party, has no standing to contest it. Egypt treats the agreement as valid, and EU institutions express solidarity with Cyprus's sovereign rights while saying Turkish Cypriots should benefit within a settlement.

How do the 2011 TRNC agreement and TPAO licences fit in?

Türkiye granted TPAO licences in 2009 and 2012 and signed a continental shelf delimitation agreement with the TRNC on 2011-09-21, two days after unilateral GCASC drilling began. Ankara presents these steps as the exercise of its own shelf rights and of Turkish Cypriot rights.

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