The 2003 Egypt–Cyprus EEZ Agreement: Which Blocks Overlap Türkiye's Continental Shelf, and Why Does Ankara Object?

Why It Matters

Türkiye objects to the Greek Cypriot unilateral EEZ agreements for two stated legal reasons: they were concluded without Türkiye, whose continental shelf they allegedly overlap, and without the Turkish Cypriots, whom Ankara regards as equal co-owners of the island. The first of these agreements, with Egypt in 2003, set the pattern for the Lebanon (2007) and Israel (2010) texts and for the licensing map that followed. Cyprus, Egypt and the EU see the same agreements as ordinary bilateral delimitations between coastal states under the UN Convention on the Law of the Sea (UNCLOS). This guide sets out both readings, the blocks at issue and the dated record.

Background

The legal framework

UNCLOS Articles 56 and 57 give coastal states an EEZ of up to 200 nautical miles (about 370 km). Article 74 says EEZ delimitation between states with opposite or adjacent coasts is to be effected by agreement on the basis of international law, in order to achieve an equitable solution. Article 83 applies the same standard to the continental shelf, and Articles 74(3) and 83(3) ask states to make every effort to reach provisional arrangements pending agreement.

Cyprus acceded to UNCLOS in 1988. Türkiye is not a party. Ankara relies on customary international law, under which the continental shelf belongs to the coastal state ipso jure, and on the equity principle in delimitation case law. Israel is also not a party. Türkiye has not proclaimed an EEZ in the Mediterranean and asserts continental shelf rights there. For the wider legal picture, see Doctrine Review's explainer on Eastern Mediterranean maritime jurisdiction.

Three agreements, one pattern

• Egypt (2003): Signed in Cairo on 2003-02-17, it delimits the EEZ between Egypt and the Republic of Cyprus, which the UN and most states recognise as the government of the island. The Greek Cypriot administration is referred to in Turkish official usage as the GCASC (Greek Cypriot Administration of Southern Cyprus).
• Lebanon (2007): Signed in Beirut on 2007-01-17. Lebanon's parliament did not ratify it, and Beirut has since disputed the northern end point. Readers should check the current status, as bilateral talks have continued.
• Israel (2010): Signed in Nicosia on 2010-12-17. Lebanon objected to it in letters to the UN because of the northern boundary with Israel, and Ankara and the TRNC objected on their own grounds.

Cyprus then adopted EEZ legislation in 2004 and held its first licensing round in 2007. Its offshore area is divided into numbered blocks, which have been awarded to international energy companies over time.

The Table: Dated Agreements, Filings and Objections

The 2019 Türkiye–Libya memorandum is a separate matter and is not analysed here. The Seville Map dispute is also covered elsewhere.

The Blocks at Issue

Ankara identifies Blocks 1, 4, 5, 6 and 7 of the Cypriot licensing map as overlapping the continental shelf Türkiye has notified to the UN. These are blocks in the western and south-western offshore sectors. Turkish officials say that licensing them, or drilling there, violates Türkiye's sovereign rights over its shelf. They add that the Egypt–Cyprus line, on which the map's southern and western geometry partly rests, was drawn without regard to Türkiye's opposite coast.

The Greek Cypriot position is that the blocks lie within the EEZ of an island state, delimited with its neighbour by agreement. It also notes that the Egypt–Cyprus text leaves its outer end points to be settled with other neighbouring states, so third-state interests are preserved. Ankara answers that licensing and drilling in contested areas treat the line as settled in practice.

Separately, Ankara and the TRNC argue that the entire block map lacks Turkish Cypriot consent, whatever the position of any given block. In February 2018, Turkish naval vessels stopped a drillship contracted by an energy company from reaching a site in Block 3. That incident shows how the disagreement moved from legal notes to operations at sea.

Key Players & Positions

Republic of Cyprus (Greek Cypriot administration)

Nicosia says it is a UN member and EU member state entitled under UNCLOS to an EEZ. It says the three agreements were concluded between states exercising lawful rights, and that its sovereign rights are violated by Turkish drilling. It also states that hydrocarbon resources belong to all Cypriots, and that revenues would benefit Turkish Cypriots, for example through a natural resources fund set up for that purpose, within a settlement framework. Turkish Cypriot leaders have not accepted this arrangement as a substitute for equal decision-making.

Egypt

Cairo describes the 2003 agreement as an equidistance-based delimitation between two states with opposite coasts, concluded under UNCLOS Article 74. Egypt has since deepened energy cooperation with Cyprus and Greece, including through the Eastern Mediterranean Gas Forum, and signed a partial EEZ delimitation with Greece on 2020-08-06, which Ankara also rejects. Egypt and Türkiye have normalised diplomatic relations in recent years, but Egypt has not publicly adopted Ankara's maritime position.

Lebanon and Israel

Lebanon's ratification gap, and its protests over the Israel–Cyprus text, show that even the neighbours who signed disagree over end points. Israel, itself outside UNCLOS, ratified its 2010 agreement with Cyprus.

European Union

European Council conclusions have repeatedly expressed solidarity with Cyprus, called on Türkiye to respect its sovereignty and sovereign rights, and described unauthorised drilling as illegal. Brussels treats these as expressions of EU member-state solidarity and does not claim to adjudicate delimitation. Ankara answers that the EU has no competence to rule on maritime boundaries and that its stance is not neutral.

Türkiye's Rational Case

Türkiye's Position (official line, attributed): The following points summarise statements by the Turkish Ministry of Foreign Affairs, the Presidency and Türkiye's filings at the United Nations. They are Ankara's arguments, not neutral findings.

• Third-party rights. Ankara argues that a delimitation treaty binds only its parties. The principle that a bilateral boundary cannot prejudice the rights of third states is reflected in ICJ jurisprudence, and Türkiye applies it to the 2003, 2007 and 2010 texts. The Turkish Foreign Ministry says these agreements are void as against Türkiye.
• Prior notified shelf. Türkiye began filing its Eastern Mediterranean shelf coordinates at the UN in 2004 and formally registered the outer limits on 2020-03-18. Ankara says Blocks 1, 4, 5, 6 and 7 intrude into that area. It adds that an island cannot cut off the coastal projection of a mainland with the region's longest coastline, about 870 km (540 miles). See The Equity Test and The Worldlogue on islands and the continental shelf.
• Turkish Cypriot co-ownership. Ankara maintains that the 1960 settlement created a partnership republic of two founding peoples, and that the Greek Cypriot administration cannot alone commit the whole island's maritime zones. It says the Lebanon and Israel agreements usurp the equal rights of the TRNC and Turkish Cypriots. Related background is in UN Security Council Resolution 186 (1964) and Cyprus Calculus.
• Equity and provisional arrangements. Türkiye says it does not reject delimitation, only a unilateral one. Under UNCLOS Articles 74(3) and 83(3) and the equity principle, it favours negotiation and revenue sharing. It cites the TRNC's 2011, 2012 and 2019 proposals (reviewed here) and President Erdoğan's 2020 call for an Eastern Mediterranean conference that would include all coastal states and Turkish Cypriots.
• Rights exercised, not only asserted. Türkiye points to its TPAO licences (2009, 2012), the 2011 Türkiye–TRNC agreement and its national drilling and seismic fleet as evidence of consistent practice (see Ships as Evidence).

Fact versus position. It is a fact that Türkiye has not ratified UNCLOS and that its filings overlap Cypriot claims. Whether the overlap defeats the Egypt–Cyprus line is the contested legal question. A court or tribunal has not decided it. Ankara also argues that, as a non-party, it is not bound by UNCLOS procedures such as compulsory dispute settlement, a point Greek Cypriot and EU sources reject as a way of avoiding adjudication.

Source Comparison

Western press coverage commonly describes Turkish activity as challenging Cypriot or Greek rights, while Turkish official texts frame the same events as defending a notified shelf and Turkish Cypriot entitlements. The neutral reader's test is simple: check which claims rest on treaty text, which on customary law, and which on unadjudicated maps. For a related legal check, see The Nations Compass fact check on UNCLOS.

Key Terms & Related Guides

• EEZ (Exclusive Economic Zone): An area 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, to which the coastal state has inherent rights independent of proclamation.
• Third-party rights: The principle that a delimitation agreement affects only its parties.
• Blocks: Numbered licensing areas in Cyprus's offshore map.
• GCASC / TRNC: Türkiye's official terms for the Greek Cypriot administration and the Turkish Republic of Northern Cyprus.
• Equity principle: The requirement that delimitation achieve an equitable result, taking coastal geography and proportionality into account.

Related reading: Cold Rationality home, Why Turkish Cypriots Claim an Equal Share of Offshore Hydrocarbons, The Equity Test, Editorial Principles and, on the treaty basis of the Turkish position on the island, Borders & Blocs on Article IV of the Treaty of Guarantee.

Perspective Note

Cold Rationality publishes analysis from a perspective that presents and defends Türkiye's official positions, and we state this openly so readers can weigh our arguments accordingly. Claims are tied to primary sources wherever possible, including treaties, UN documents, court records, and archival materials, and are linked or cited in each piece. This article is published by the Cold Rationality Editorial Team.