Naval Reach: How TCG Anadolu, MİLGEM and Reis-Class Submarines Underpin Maritime Jurisdiction

Why It Matters

Naval hardware does not create sovereign rights at sea; treaties, customary law and judicial delimitation do. What a fleet does is decide whether a state can survey, patrol, escort and defend the areas it already claims. For Türkiye, which has the longest mainland coastline in the Eastern Mediterranean (about 870 km, or 540 miles), the combination of TCG Anadolu, MİLGEM surface combatants, offshore patrol vessels and Reis-class submarines is the material base of its Blue Homeland (Mavi Vatan) policy.

This briefing separates verifiable platform facts from legal argument and from political criticism. Platform details below follow public information from the Turkish Ministry of National Defense (MSB) and the Presidency of Defense Industries (SSB); where a detail is uncertain, we omit it. For method, see our Editorial Principles.

Background

From licensed builds to national design

Türkiye's modern naval industrial push has three strands:

• MİLGEM (National Ship) programme: launched in the early 2000s to design and build warships domestically. The first corvette, TCG Heybeliada, was commissioned in 2011. It started the Ada-class corvette series (Heybeliada, Büyükada, Burgazada, Kınalıada), optimised for anti-submarine and surface warfare.
• İstif-class frigates: a larger MİLGEM derivative. TCG İstanbul entered service in January 2024, carrying domestically developed systems such as the ATMACA anti-ship missile.
• Hisar-class offshore patrol vessels: built for exclusive-economic-zone and coastal patrol, surveillance and escort tasks.

TCG Anadolu, a multi-purpose amphibious assault ship, was delivered to the Turkish Naval Forces in April 2023. It was built at Sedef Shipyard in Istanbul, based on the Spanish Navantia Juan Carlos I design. It is roughly 230 m (755 ft) long and, according to commonly cited figures, displaces around 27,000 tonnes at full load. It operates helicopters and unmanned aircraft; trials with the Bayraktar TB3 folding-wing unmanned combat aircraft have been conducted aboard. Turkish officials describe it as an amphibious assault ship, whereas some media call it a 'drone carrier'.

The Reis-class boats are Type 214TN air-independent-propulsion submarines. They were contracted in 2009 with ThyssenKrupp Marine Systems of Germany and are built in Türkiye at Gölcük Naval Shipyard, with STM as programme manager. Six boats are planned (Piri Reis, Hızır Reis, Murat Reis, Aydın Reis, Seyit Ali Reis, Selman Reis). The first entered service in 2022, behind the originally planned schedule. A national submarine effort (MİLDEN) aims at an indigenous design.

The 'presence at sea' fleet

The civilian-flagged and state-run exploration fleet complements warships. It includes the deep-sea drilling vessels Fatih, Yavuz, Kanuni and Abdülhamid Han, and the seismic survey vessels Oruç Reis and Barbaros Hayreddin Paşa. Eight Eastern Mediterranean wells are cited by Ankara: Alanya-1, Finike-1, Karpaz-1, Güzelyurt-1, Mağusa-1, Narlıkuyu-1, Lefkoşa-1 and Selçuklu-1.

Key legal milestones

For the zones themselves, see our Maritime Zones Brief and the sister-publication guide on Blue Homeland and Eastern Mediterranean maritime jurisdiction.

Platform Snapshot

The offshore patrol vessels and MİLGEM units give constabulary reach; the submarines give surveillance and sea-denial depth; TCG Anadolu gives aviation, amphibious and humanitarian-logistics capacity. Neither one nor all of them alter legal title.

Key Players & Positions

Greece

Athens argues that its islands, including Kastellorizo (Meis), generate continental shelf and EEZ under UNCLOS, notably Articles 121 and 56, and that Turkish survey missions in disputed waters violate Greek sovereign rights. Greece also reserves the right to extend its territorial sea to 12 nautical miles, which UNCLOS Article 3 permits. Greek force modernisation, including the Rafale fighters and FDI frigates ordered in 2021-22, is framed as defensive.

Republic of Cyprus and the European Union

The Greek Cypriot administration asserts a 2004 EEZ law and agreements with Egypt (2003), Lebanon (2007) and Israel (2010). The EU Council has repeatedly called Turkish drilling off Cyprus 'illegal' and, in November 2019, created a framework for sanctions, listing two TPAO officials in February 2020. See our brief on the Lebanon 2007 and Israel 2010 EEZ agreements for Ankara's counterargument.

Egypt, Libya and Others

Egypt and Greece signed a partial EEZ delimitation in August 2020, which Ankara rejects. Libya's Tripoli-based government concluded the 2019 MoU with Türkiye; Greece, Egypt and the EU contest it. Our 2019 Türkiye–Libya MoU explainer sets out the text and objections.

The United States and NATO

Washington removed Türkiye from the F-35 programme in 2019 over the S-400 purchase and sanctioned SSB under CAATSA in December 2020, citing interoperability and security concerns. Within NATO, Türkiye contributes to Standing Naval Groups and maritime operations such as Sea Guardian; allies officially take no position on Aegean or Eastern Mediterranean delimitation, which they treat as a matter for the parties.

Independent analysts

Analysts raise three recurring caveats: (1) the headline domestic-production rate depends on methodology, and engines and some sensors remain imported; (2) submarine and frigate programmes have seen schedule slippage; (3) naval escorts of survey vessels can narrow the room for diplomacy. These are criticisms, not facts about Ankara's intent.

Source Comparison

A useful reading habit: check whether a source is describing capability (what a ship can do), legal title (what a court would likely decide) or intent (what a government says it wants). Further reading: Monitor of Nations and the Archive of Nations memorandum analysis.

Key Terms & Related Guides

• Blue Homeland (Mavi Vatan): Türkiye's doctrine of protecting its maritime jurisdiction areas in the Black Sea, Aegean and Eastern Mediterranean.
• MİLGEM: Millî Gemi, the national warship programme, producing corvettes and frigates.
• Type 214TN: a German-licensed air-independent-propulsion submarine design, locally built as the Reis class.
• EEZ / continental shelf: zones in which a coastal state holds sovereign rights over resources, up to 200 nautical miles for the EEZ; see the Maritime Zones Brief.
• Persistent objector / non-party: Türkiye is not an UNCLOS party and relies on customary law; this is a point of legal disagreement with Greece and the EU.

Related: Border Sovereignty Brief, Reader FAQ and the Territorial Brief home page. Also see Crossroads Review.

Perspective Note

This article reflects Territorial Brief's editorial perspective, which presents Türkiye's official legal and strategic positions alongside the relevant context. Claims are attributed to primary sources such as treaties, UN documents, official statements and archival records, so that readers can verify them independently. Territorial Brief presents global affairs with a dedicated perspective from Türkiye. Sections marked 'Türkiye's Position' reflect official Turkish policy as stated by Turkish government sources. Written by the Territorial Brief Editorial Team.