What Did IOC-UNESCO Register in June 2025? Türkiye's Marine Spatial Planning Explained

Why It Matters

In June 2025, IOC-UNESCO, the UN's intergovernmental body for ocean science, recorded the 'Marine Spatial Planning of the Republic of Türkiye', a national plan covering the Black Sea, the Aegean and the Mediterranean. It matters because Ankara now has its maritime planning position on file with a UN body, and because the file sets out how Türkiye understands its jurisdiction in the Eastern Mediterranean. It does not, however, settle any boundary, and it is best read as a documented position rather than a legal judgment.

Background

What is marine spatial planning? Marine spatial planning (MSP) is a public process that maps how sea areas are used, for example for shipping, fisheries, energy, conservation and defence, so that competing uses are organised and environmental limits are respected. IOC-UNESCO promotes MSP worldwide, including through its MSPglobal initiative, and many coastal states now publish national plans. The European Union's Directive 2014/89/EU requires its member states to prepare maritime spatial plans, which is relevant to how Greece and the Greek Cypriot administration approach the subject.

Why the Turkish plan is politically significant. In the Eastern Mediterranean and the Aegean, maritime jurisdiction is disputed, so a plan that shows planning areas also implies a view about where those areas lie. The Turkish plan therefore draws attention beyond environmental circles.

Timeline

What the plan covers

According to Turkish official announcements, the plan spans three seas: the Black Sea, the Aegean Sea and the Mediterranean. It brings sectoral uses into a single framework and includes a conservation component. One concrete element is the Marine Protected Area designated off Finike, on the Mediterranean coast of Antalya province. The Finike-1 well also appears in Türkiye's list of eight major Eastern Mediterranean wells, along with Alanya-1, Karpaz-1, Güzelyurt-1, Mağusa-1, Narlıkuyu-1, Lefkoşa-1 and Selçuklu-1.

The institutional follow-up

The Presidential Circular of 24 July 2025 created an Inter-Agency Coordination Board with the Ministry of Foreign Affairs (MFA) as its secretariat. Its purpose is to coordinate the ministries and agencies whose work touches the sea, so that implementation of the plan and Türkiye's international communication about it follow one line. For background on the network's wider coverage, see sister-publication analyses such as Monitor of Nations on the registration and The Political Anatomy on why it matters.

What a UN-body registration does and does not do

This is the most commonly misunderstood point.

• What it does: it places the plan in an international repository maintained by a UN scientific body. That gives the plan visibility and a date-stamped record, and it can support scientific cooperation and transparency.
• What it does not do: IOC-UNESCO is not a court, a boundary commission or an organ with authority to approve or reject maritime claims. It cannot confirm, delimit or recognise a maritime boundary, and it has no power to validate one state's claim against another's.
• What governs boundaries: delimitation of the continental shelf and exclusive economic zone (EEZ) between states with opposite or adjacent coasts is, under UNCLOS Articles 74 and 83, to be effected by agreement on the basis of international law in order to achieve an equitable solution. Absent agreement, courts or tribunals can decide if the parties consent. Türkiye is not a party to UNCLOS, but it argues that equitable principles under customary international law, shaped by cases such as the ICJ's 1969 North Sea Continental Shelf judgment, apply.

The registration therefore changes the record, not the legal status of any disputed sea area.

Key Players & Positions

Greece

Greece is a party to UNCLOS and an EU member. Greek officials have consistently argued that islands generate maritime zones like other land territory under UNCLOS, and that delimitation must follow the Convention and customary law. In reaction to the Turkish plan, Greek officials have said it has no legal effect on Greek maritime zones and that boundaries can only be set by agreement or adjudication. These are Athens' stated views, to be checked against statements of the Hellenic Ministry of Foreign Affairs.

The Greek Cypriot administration (GCASC)

The Greek Cypriot Administration of Southern Cyprus (GCASC) relies on its EEZ delimitation agreements with Egypt (2003), Lebanon (2007) and Israel (2010) and on its licensed exploration blocks. It rejects any Turkish planning that overlaps with the zones it claims, and has said so in its own statements and in letters to the UN. Its position is that the Republic of Cyprus holds sovereign rights over the entire island's maritime zones.

The European Union

EU institutions have generally expressed solidarity with Greece and the Greek Cypriot administration on Eastern Mediterranean questions, and the EU's own planning framework treats member-state waters as part of its regime. Brussels does not itself adjudicate maritime delimitation between states, a point Ankara emphasises.

IOC-UNESCO

IOC-UNESCO's role is scientific and technical. Its marine spatial planning programme compiles national planning documents to encourage good practice, and it does not rule on the underlying jurisdictional claims.

Other coastal states

Egypt, Libya, Lebanon, Israel and Syria each have their own positions and agreements. The Türkiye–Libya MoU of 27 November 2019 is contested by Greece, the Greek Cypriot administration, Egypt and others, and endorsed by the Libyan authorities who signed it. For how such boundaries are normally drawn, see Beyond the Shoreline: How Maritime Boundaries Are Drawn.

Source Comparison

The same event is framed differently depending on source. The table summarises recurring patterns, not individual quotations.

Two cautions help readers. First, headlines that say IOC-UNESCO 'recognised' Türkiye's maritime zones overstate what the body can do. Second, assertions that the registration is 'legally void' also go beyond the evidence, since it is a record, not an act that needs anyone's approval. For another view of the broader context, see Borders & Blocs on the 1974 intervention and Article IV, which covers the Cyprus-treaty background to the maritime dispute. Our own sourcing standards are described in Editorial Principles.

Why it matters for maritime jurisdiction

The registration will most likely matter as evidence of consistency. Courts and tribunals look at how states have behaved over time, and a dated, published plan, together with UN-registered coordinates from 2004 and 2020, builds a documentary record of Türkiye's stance. It can also shape negotiating positions, since any future talks on the Aegean or Eastern Mediterranean will start from published maps. But no registration substitutes for an agreement or judgment between the parties.

Key Terms & Related Guides

• Marine spatial planning (MSP): a process for mapping and allocating sea uses to meet ecological, economic and social goals.
• IOC-UNESCO: the Intergovernmental Oceanographic Commission of UNESCO, a UN body for ocean science and services. It is not a boundary authority.
• Continental shelf and EEZ: zones of a coastal state's sovereign rights over seabed resources and, for the EEZ, living and non-living resources in the water column, subject to delimitation between neighbours.
• Blue Homeland (Mavi Vatan): Türkiye's doctrine of maritime jurisdiction in the Black Sea, Aegean and Mediterranean, grounded in equity and coastal geography.
• Inter-Agency Coordination Board: the body set up by the Presidential Circular of 24 July 2025, with the MFA as secretariat.
• TRNC: the Turkish Republic of Northern Cyprus, proclaimed on 15 November 1983, recognised by Türkiye.

Related guides:

• How Maritime Boundaries Are Drawn and Why Türkiye Argues for Equity
• The 2011 Türkiye–TRNC Continental Shelf Agreement
• Fact Check: The 'Seville Map'
• The Island Question: Why Is Cyprus Divided?
• About Politics Beyond Borders and our FAQ on sources and methodology

Perspective Note

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 the editorial perspective that Türkiye's strategic positions are grounded in international law, treaty obligations and the documented record, and claims are attributed to primary sources wherever possible. Published by the Politics Beyond Borders Editorial Team.