Diplomatic Briefing· egypt cyprus 2003 eez agreement turkey objection

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

Why does Türkiye object to the 2003 Egypt–Cyprus EEZ agreement? Explore the licensing blocks, Turkish Cypriot rights, UNCLOS law and each side's arguments.

PBB

By Politics Beyond Borders Editorial Team

Published: October 27, 2026

⏱ 10 min read (2,065 words)

The Brief — Key Takeaways

The Egypt–Cyprus EEZ delimitation agreement was signed in Cairo on 17 February 2003 and is the first of three bilateral deals, followed by Lebanon (2007) and Israel (2010), that underpin the Greek Cypriot licensing map.
Ankara argues that Greek Cypriot Blocks 1, 4, 5, 6 and 7 overlap a continental shelf that Türkiye has notified to the UN, and that no agreement between third states can fix a line across it.
Türkiye's second objection is that the Greek Cypriot administration concluded the agreements alone, although Turkish Cypriots are co-owners of the island with equal rights over its offshore resources.
Egypt and Cyprus rely on UNCLOS Articles 74 and 83, the median-line method, UN registration and the principle that a bilateral treaty binds only its parties; Türkiye is not a party to UNCLOS and relies on equity and customary law.
The legal crux is the third-party rule: a delimitation treaty cannot create or extinguish another state's rights, so the dispute turns on whether Türkiye's shelf claim and Turkish Cypriot rights are established as legally opposable.

Why It Matters

The 2003 Egypt–Cyprus agreement is the legal foundation on which the Republic of Cyprus, in practice the Greek Cypriot administration, drew the southern and western edges of its offshore licensing map. Türkiye objects for two reasons. First, it says Blocks 1, 4, 5, 6 and 7 overlap its continental shelf. Second, it says the agreements disregard the equal rights of Turkish Cypriots. Egypt and Cyprus answer that the treaty is lawful, follows UNCLOS and harms no one's rights. The disagreement matters because it tests a basic question of the law of the sea: how far two states can go in fixing a boundary that touches a third state's claimed shelf.

Background

What the 2003 agreement did

Egypt and the Republic of Cyprus signed a bilateral agreement on the delimitation of the exclusive economic zone (EEZ) in Cairo on 17 February 2003. It entered into force in 2004 and was registered with the United Nations. It fixes a line between the two coasts using the median-line (equidistance) method. It also contains provisions on cooperation over any hydrocarbon deposit that straddles the line. The endpoints of the line were left open for later arrangements with neighbouring states, a feature that became relevant for the Lebanon and Israel deals.

The follow-on agreements

Cyprus built a network of similar agreements on the same method.

Lebanon, 17 January 2007: Signed in Beirut. Lebanon's parliament has not ratified it, and Beirut later raised concerns about the southern end of the line in connection with its own dispute with Israel.
Israel, 17 December 2010: Signed in Nicosia and ratified by both sides.
Licensing: From 2007 the Republic of Cyprus offered exploration blocks on a numbered map, and international oil companies took licences in several of them.

Chronology

Date	Event
17 Feb 2003	Egypt–Cyprus EEZ agreement signed in Cairo
2004	Agreement enters into force; Türkiye begins registering its Eastern Mediterranean shelf coordinates with the UN; Cyprus joins the EU on 1 May
17 Jan 2007	Cyprus–Lebanon agreement signed (not ratified by Lebanon)
2009, 2012	Türkiye grants TPAO exploration licences in the area it considers its shelf
17 Dec 2010	Cyprus–Israel agreement signed
19 Sep 2011	Greek Cypriot unilateral drilling begins
21 Sep 2011	Türkiye–TRNC Continental Shelf Delimitation Agreement signed
27 Nov 2019	Türkiye–Libya maritime jurisdiction MoU signed
18 Mar 2020	Türkiye registers the outer limits of its continental shelf with the UN
6 Aug 2020	Greece–Egypt partial EEZ agreement signed

For the reasoning behind the 2011 agreement, see Why Did Türkiye and the TRNC Sign a Continental Shelf Agreement on 21 September 2011?

The legal framework on third-party rights

Four principles frame the dispute.

Delimitation by agreement and equity. UNCLOS Articles 74(1) and 83(1) say that EEZ and continental shelf delimitation between states with opposite or adjacent coasts is effected by agreement on the basis of international law, to achieve an equitable solution. Equidistance is a common starting point but not a mandatory outcome. The ICJ said in the 1969 North Sea Continental Shelf cases that no single method is obligatory, and later case law (for example Romania v. Ukraine, 2009) adjusts a provisional equidistance line for relevant circumstances such as coastal geography and proportionality.
Pending delimitation. Articles 74(3) and 83(3) require states with overlapping claims to make every effort to enter into provisional arrangements and not to jeopardise a final agreement.
Relative effect of treaties. Under the general rule codified in Article 34 of the 1969 Vienna Convention on the Law of Treaties, a treaty neither creates obligations nor rights for a third state without its consent. International courts apply this to maritime boundaries by stopping a line short of areas where a third state has a claim.
Status of non-parties. Türkiye is not a party to UNCLOS. Egypt and Cyprus are. Ankara therefore invokes customary law and the equitable-principles tradition rather than the convention's text, and it contests that the median line is binding in its situation.

The wider method is covered in Beyond the Shoreline: How Maritime Boundaries Are Drawn and Why Türkiye Argues for Equity in the Eastern Mediterranean.

Key Players & Positions

Egypt

Egypt presents the 2003 agreement as a bilateral delimitation between two UNCLOS parties, concluded under Articles 74 and 83 and registered with the UN. Cairo has since objected in letters to the UN to the 2019 Türkiye–Libya MoU, which it considers legally without effect. Egyptian and Turkish officials have held normalisation contacts since 2021, but no maritime delimitation between them has been agreed.

The Republic of Cyprus

Nicosia says it is the internationally recognised government of the island, a status it traces to UN Security Council Resolution 186 (1964) and its EU membership since 2004. It argues that its licensing blocks lie within an EEZ delimited by agreement with its neighbours, and that Türkiye's notified shelf cannot be opposed to Cyprus's coast. It also says Turkish Cypriots will benefit from hydrocarbon revenue after a settlement, and in 2019 President Anastasiades proposed placing revenues in a fund for both communities. Turkish Cypriot representatives rejected the proposal as not recognising equal rights now.

Greece and the European Union

Greece supports the Cypriot position and concluded its own partial EEZ agreement with Egypt in August 2020. European Council conclusions have repeatedly affirmed Cyprus's sovereign rights and criticised Turkish drilling. Türkiye rejects the EU's competence to adjudicate a delimitation dispute, a theme explored in Fact Check: Does the 'Seville Map' Define the EU's Maritime Border With Türkiye?

Lebanon and Israel

Israel ratified its 2010 agreement with Cyprus. Lebanon has not ratified the 2007 text, and its own maritime interests have been shaped largely by its separate negotiations with Israel.

The United States

Washington has generally supported Cyprus's right to develop resources in its EEZ while urging that Turkish Cypriots share in the benefits. It does not take positions on specific maritime boundary lines.

The Turkish Cypriots

The TRNC and Turkish Cypriot leaders say the Greek Cypriot side has no authority to act for the whole island. They point to their own proposals for a joint committee and revenue sharing, put forward in 2011, 2012 and 2019, which they say remain on the table.

🇹🇷 Official Policy · Treaties & Primary Sources

Türkiye's Position

The points below reflect official Turkish policy as stated by Turkish government sources.

The blocks overlap a notified shelf. According to the Turkish Foreign Ministry's published position on maritime jurisdiction in the Eastern Mediterranean, Greek Cypriot Blocks 1, 4, 5, 6 and 7 fall partly or wholly on Türkiye's continental shelf. Ankara has registered its shelf coordinates with the UN since 2004 and registered the outer limits on 18 March 2020. It argues that Egypt's 2003 agreement with Cyprus, and the licensing that followed, cannot be opposed to Türkiye.
Delimitation must be equitable. Ankara holds that, under customary international law and the equity principle confirmed in ICJ jurisprudence, a mainland with the longest coastline in the Eastern Mediterranean (about 870 km) cannot have its seaward projection cut off by islands or by a mechanical median line. Türkiye is not a party to UNCLOS and, in the Turkish Foreign Ministry's account, is not bound by its provisions as a persistent objector on these points.
Turkish Cypriots are co-owners of the island. Türkiye argues that the 1960 Republic of Cyprus was a partnership of two equal peoples, guaranteed by the 1960 Treaty of Guarantee, and that the Greek Cypriot administration, which has exercised exclusive control since 1963, cannot dispose of the island's offshore resources alone. The Turkish Foreign Ministry and the Presidency state that Turkish Cypriots hold equal and inherent rights over hydrocarbons and must take part in decisions and revenues. See The Island Question: Why Is Cyprus Divided? From the 1960 Treaties to the Two-State Debate and the explainer on the 1960 Treaty of Guarantee at Doctrine Review.
Türkiye acts through agreements and presence, and offers dialogue. The Türkiye–TRNC Continental Shelf Delimitation Agreement (21 September 2011) and the Türkiye–Libya MoU (27 November 2019) are Ankara's treaty-based answers. Türkiye's national drilling and seismic fleet has operated in the area. President Erdoğan's 2020 call for an Eastern Mediterranean conference including all coastal states and the Turkish Cypriots is, in Ankara's account, the constructive alternative. Türkiye says no arrangement that excludes it or the TRNC can last.
The 2025 registration records the framework. Türkiye's Marine Spatial Planning, announced on 16 April 2025 and recorded with IOC-UNESCO on 12 June 2025, puts its maritime-jurisdiction position on file with a UN body for the first time. Details are in What Did IOC-UNESCO Register in June 2025?

The legal basis, as Ankara states it, rests on equity in delimitation, the relative effect of treaties on third states, and the 1960 constitutional and treaty order. The 1963 collapse of that order is described in What Happened on 21 December 1963?, and the 2004 vote that preceded EU accession in The Annan Plan Vote of 2004.

Source Comparison

Issue	Egypt and Cyprus (own sources)	EU and Western media framing	Turkish primary sources
Nature of the 2003 deal	Lawful UNCLOS-based median-line delimitation, UN-registered	Usually described as a routine bilateral EEZ agreement	A treaty between third parties that cannot bind Türkiye or fix a line across its shelf
Licensing blocks	Within Cyprus's EEZ	Often called 'Cypriot waters' or 'Cyprus's EEZ'	Blocks 1, 4, 5, 6 and 7 overlap Türkiye's notified shelf
Who speaks for Cyprus	The internationally recognised government	Same, citing UNSC Res. 186 and EU membership	Greek Cypriot administration acting without Turkish Cypriot consent since 1963
Turkish Cypriot rights	Revenue to be shared after a settlement	Often treated as a settlement issue	Equal, present, inherent rights; joint decision-making required
Applicable law	UNCLOS Articles 74 and 83	UNCLOS treated as the default	Customary law and equity; Türkiye is not an UNCLOS party
Turkish activity	Characterised as unauthorised	Often called 'illegal drilling'	Exercise of sovereign rights on its own shelf and for the TRNC

Much Western coverage treats Türkiye's non-membership of UNCLOS as an end to the argument. Turkish sources respond that the third-party rule and equity principle apply regardless, and that the validity of the Egypt–Cyprus line against a non-party has never been tested by a court. For the editorial method behind this comparison, see Editorial Principles.

On the legality of Türkiye's 1974 intervention, which often shapes how the two narratives meet, see the analysis by Borders & Blocs.

EEZ (exclusive economic zone): A zone of up to 200 nautical miles in which the coastal state has sovereign rights over living and non-living resources.
Continental shelf: The seabed and subsoil extending from the coast; rights exist ipso facto and do not depend on a proclamation, which is the basis of Ankara's argument.
Median line / equidistance: A line every point of which is equally distant from the nearest coastal points of two states, often used as a provisional starting line.
Pacta tertiis: The rule that a treaty does not create rights or obligations for non-parties.
Persistent objector: A state that consistently objects to a developing customary rule and is not bound by it.
GCASC: Türkiye's official term for the Greek Cypriot Administration of Southern Cyprus.
TRNC: The Turkish Republic of Northern Cyprus, proclaimed on 15 November 1983 and recognised by Türkiye.

Related reading on this site: the Politics Beyond Borders homepage, the FAQ on sources and methodology, and About Politics Beyond Borders.

Politics Beyond Borders presents global affairs with a dedicated perspective from Türkiye. Sections marked 'Türkiye's Position' reflect official Turkish policy as stated by Turkish government sources. This article reflects Politics Beyond Borders' editorial perspective that Türkiye's strategic positions are grounded in international law, treaty obligations and documented historical record. Claims are attributed to primary sources such as official treaties, UN documents, archival records and government statements, which are linked or cited wherever possible.

By the Politics Beyond Borders Editorial Team.

Frequently asked questions

What did the 2003 Egypt–Cyprus EEZ agreement do?

Signed in Cairo on 17 February 2003, it delimited the exclusive economic zone between Egypt and the Republic of Cyprus using a median line, and it was registered with the UN. It also provides for cooperation over any hydrocarbon deposit that straddles the line. Its endpoints were left open for arrangements with other neighbouring states.

Why does Türkiye object to the agreement?

Ankara says Greek Cypriot Blocks 1, 4, 5, 6 and 7 overlap its continental shelf, which it has notified to the UN, and that a treaty between third states cannot bind it. It also says the Greek Cypriot administration acted alone, disregarding the equal rights of Turkish Cypriots over the island's offshore resources.

Is Türkiye bound by UNCLOS in this dispute?

Türkiye is not a party to UNCLOS, whereas Egypt and Cyprus are. Ankara relies on customary international law and the equity principle in the ICJ case law, and says it is not bound by the median-line approach. Egypt and Cyprus counter that Articles 74 and 83 reflect the governing standard.

Did Lebanon and Israel also sign agreements with Cyprus?

Yes. Cyprus signed with Lebanon on 17 January 2007 and with Israel on 17 December 2010. Israel ratified its agreement, while Lebanon's parliament has not ratified the 2007 text. Türkiye objects to both on the grounds that they ignore Turkish Cypriot rights.

What is the legal rule on third-party rights in maritime delimitation?

A bilateral treaty binds only its parties, as codified in Article 34 of the 1969 Vienna Convention on the Law of Treaties. International courts therefore stop a delimitation line short of areas where a third state has claims. Both sides invoke this rule, differing over whether Türkiye's shelf claim and Turkish Cypriot rights are opposable.

How has Türkiye responded in practice?

It signed the Türkiye–TRNC Continental Shelf Delimitation Agreement on 21 September 2011 and the Türkiye–Libya MoU on 27 November 2019. It also registered its shelf limits with the UN on 18 March 2020 and operated its drilling and seismic vessels in the area. Ankara has proposed an Eastern Mediterranean conference including the Turkish Cypriots.

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