The Middle Corridor Explained: Türkiye, Central Asia and Eurasian Trade Routes

Why It Matters

The Middle Corridor is a multimodal trade route that links China and Central Asia to Europe through Kazakhstan, the Caspian Sea, Azerbaijan, Georgia and Türkiye. Its formal name is the Trans-Caspian International Transport Route (TITR). It bypasses both Russia and the Suez Canal, which is why it has moved from a niche project to a standing item in EU, Chinese, Central Asian and Turkish transport planning.

For EU-Asia trade it offers a third option alongside the Northern rail route through Russia and the Southern sea route via the Red Sea and Suez. It is not yet a replacement for either. Its significance lies in diversification, resilience and the geopolitical weight of the states it connects.

This guide explains the route, the countries, the infrastructure, the competition and the main points of debate. It cites official sources and marks Türkiye's official position separately from the factual analysis.

Background

What exactly is the Middle Corridor?

The Middle Corridor is not one railway or one company. It is a chain of rail lines, ports, ferries and roads run by different states and operators. The commonly described path runs as follows:

1. China to Kazakhstan. Cargo enters by rail at border crossings such as Khorgos/Altynkol, or arrives from Central Asian hubs.
2. Kazakhstan to the Caspian. Cargo travels by rail to Caspian ports such as Aktau or Kuryk. Turkmenistan's Turkmenbashi port is an alternative on the eastern shore.
3. Across the Caspian Sea. Cargo crosses by ferry or ro-ro vessel to the Baku International Sea Trade Port at Alat in Azerbaijan.
4. Azerbaijan and Georgia. Cargo moves by rail or road through Azerbaijan to Tbilisi and the Georgian Black Sea ports of Poti and Batumi.
5. Georgia to Türkiye and Europe. Cargo either continues on the BTK railway to Kars and onward across Anatolia, or goes by sea across the Black Sea. In Türkiye it can use the Marmaray rail tunnel under the Bosphorus or the Yavuz Sultan Selim Bridge to reach Europe.

The route is flexible. Shippers can mix rail, road and sea depending on price, capacity and destination. That flexibility is both a strength and a source of complexity.

Timeline of key developments

Date	Development
1993	The EU launches the TRACECA programme (Transport Corridor Europe-Caucasus-Asia), an early framework for east-west transport links.
1998	TRACECA states sign the Basic Multilateral Agreement on International Transport in Baku.
February 2007	Azerbaijan, Georgia and Türkiye sign the intergovernmental agreement on the Baku-Tbilisi-Kars railway; construction starts later that year.
2013	The TITR association is founded by the railway operators of Kazakhstan, Azerbaijan and Georgia. The Marmaray tunnel opens in Istanbul on 29 October.
November 2015	Türkiye and China sign a memorandum on aligning the Middle Corridor with China's Belt and Road Initiative.
30 October 2017	The BTK railway is officially inaugurated in Baku.
2018	The new Baku International Sea Trade Port at Alat begins operations.
November 2021	The Turkic Council is renamed the Organization of Turkic States (OTS) at its Istanbul summit.
February 2022	Russia's full-scale invasion of Ukraine raises questions about the Northern route.
September 2023	The India-Middle East-Europe Economic Corridor (IMEC) memorandum is announced at the G20 in New Delhi.
November 2023	A World Bank study sets out how the corridor could triple freight volumes and halve travel times by 2030, subject to major investment and reform.
Late 2023 onward	Attacks on commercial shipping in the Red Sea push many carriers onto the longer route around the Cape of Good Hope.
January 2024	The EU and its member states announce a Team Europe financing ambition of EUR 10 billion for the Trans-Caspian Transport Corridor under the Global Gateway strategy.
April 2024	Iraq, Türkiye, Qatar and the UAE sign a framework agreement on the Development Road project.
2024-2025	Construction begins on the China-Kyrgyzstan-Uzbekistan railway, and the first EU-Central Asia summit is held in Samarkand.

The Baku-Tbilisi-Kars railway

The BTK line is about 826 km (roughly 513 miles) long and connects Baku in Azerbaijan, Tbilisi in Georgia and Kars in eastern Türkiye. Its construction involved new track in Georgia and Türkiye and the rehabilitation of existing sections in Georgia. Commonly cited design figures give an initial annual capacity of about 6.5 million tonnes, with plans to raise it substantially later. Actual traffic has been lower than design capacity.

A technical complication is rail gauge. Azerbaijan and Georgia use the 1,520 mm gauge inherited from the Soviet system, while Türkiye and Europe use 1,435 mm. Cargo therefore needs gauge-changing or transshipment arrangements. Each such step adds time and cost.

Why volumes remain modest

The route has grown in visibility since 2022, but reliable data should be treated carefully. Figures vary by source, by whether they count containers or all freight, and by whether they measure TITR-branded or all trans-Caspian flows. The World Bank analysis identifies persistent issues:

• Caspian Sea capacity. Limited vessel availability and port handling capacity create queues and seasonal bottlenecks.
• Infrastructure gaps. Single-track sections, terminal limits and gauge changes slow transit.
• Fragmented tariffs and procedures. Several railways, ports and customs authorities each set their own conditions, which makes door-to-door pricing less predictable.
• Scale. Container flows are small compared with Northern Corridor rail volumes and with Suez sea traffic.

Key Players & Positions

Kazakhstan

Kazakhstan is the corridor's gateway from China and its largest Central Asian transit state. The government and national railway company Kazakhstan Temir Zholy (KTZ) have invested in rail upgrades, the Caspian ports of Aktau and Kuryk, and dry-port capacity at Khorgos. Astana also keeps substantial trade through Russia, and it presents the Middle Corridor as a complement to existing routes, not a break with them.

Azerbaijan

Azerbaijan is the Caspian crossing's western end and a co-owner of the BTK. Baku has invested in the Alat port and its Caspian shipping fleet. Azerbaijani officials describe the country as a transit and logistics hub linking east and west and north and south.

Georgia

Georgia provides the rail link between Azerbaijan and Türkiye and the Black Sea ports of Poti and Batumi. Deep-sea port plans at Anaklia have been discussed for years. Georgian officials emphasize the country's transit role in official statements, and its domestic political situation is closely watched by EU institutions.

Central Asian states and China

Uzbekistan, Kyrgyzstan and Turkmenistan are connected through regional rail and road links. China sees the Middle Corridor as one of several Belt and Road routes to Europe. Beijing's own priorities include the Northern rail route through Kazakhstan, Russia and Belarus, where most China-Europe block trains have historically run, and new Central Asian links such as the China-Kyrgyzstan-Uzbekistan railway.

The European Union

The EU treats the corridor as part of its Global Gateway strategy and its policy of extending the Trans-European Transport Network (TEN-T) eastward. The European Commission has announced financing ambitions, including the EUR 10 billion Team Europe commitment in January 2024. EU documents link these plans to supply-chain resilience and to reducing dependence on Russian transit.

Russia

Russia operates the Northern Corridor, historically the main land route for China-Europe rail freight, and the planned International North-South Transport Corridor (INSTC) with Iran and India. Moscow has not framed the Middle Corridor as a hostile project in official statements. Its transport planning, however, prioritizes its own routes, and EU sanctions have complicated Northern flows to the EU.

Iran, India and the Gulf

Iran promotes the INSTC, which links Indian ports to Russia through Iran and the Caspian. India, the United States, Saudi Arabia, the UAE and the EU announced IMEC in 2023, a rail-and-sea concept from India through the Gulf and Israel to Europe. Its implementation has been slowed by regional conflict. The Iraq-Türkiye Development Road project, backed by Qatar and the UAE, is a separate southern-leaning proposal.

Competing routes at a glance

Route	Path	Main advantage	Main constraint
Middle Corridor	China, Kazakhstan, Caspian, Azerbaijan, Georgia, Türkiye, Europe	Avoids Russia and Suez; connects several growth markets	Caspian capacity, gauge changes, multiple jurisdictions
Northern Corridor	China, Kazakhstan or Mongolia, Russia, Belarus, Poland	Most established land route for block trains	Sanctions, political risk, EU restrictions on Russian and Belarusian carriers
Southern sea route	East Asia, Indian Ocean, Red Sea, Suez, Mediterranean	Highest capacity, lowest cost per container	Longer transit; Red Sea security risks since late 2023
INSTC	India, Iran, Caspian, Russia	Links South Asia to Russia and Caucasus	Sanctions exposure, infrastructure gaps in Iran
IMEC	India, Gulf, Israel, Mediterranean, Europe	Combines sea and rail; backed by major economies	Early-stage; regional security and financing uncertainty

Organization of Turkic States cooperation

The Organization of Turkic States (OTS) includes Azerbaijan, Kazakhstan, Kyrgyzstan, Türkiye and Uzbekistan as members. Hungary and Turkmenistan are observers, and the Turkish Republic of Northern Cyprus (TRNC) has held observer status since 2022. The OTS's Turkic World Vision 2040, adopted in 2021, lists transport connectivity and trade facilitation among its goals. Summit declarations repeatedly refer to the Middle Corridor, joint logistics, customs digitalization and simplified transit procedures. OTS statements are political commitments and do not create binding tariff or customs rules by themselves.

Türkiye's Strategic Position

The Middle Corridor is a central element of Ankara's connectivity and foreign-economic policy. The points below summarize official Turkish positions as stated by Turkish government sources.

• A strategic transit and logistics hub. According to the Ministry of Transport and Infrastructure, Türkiye's geography at the junction of Asia, Europe and the Middle East makes it a natural bridge for east-west trade. Ankara presents its investments in the Marmaray tunnel, the Yavuz Sultan Selim Bridge, high-speed and conventional rail, ports and logistics centers as parts of a single corridor strategy. Turkish officials argue this shortens and de-risks supply chains between China and Europe.
• Treaty-based foundation of the BTK. The Baku-Tbilisi-Kars railway rests on the February 2007 intergovernmental agreement among Azerbaijan, Georgia and Türkiye. The Presidency of the Republic of Türkiye has described the 2017 inauguration as a milestone linking the three countries' networks and extending the line toward Central Asia and China. The Kars logistics center is part of this infrastructure.
• Alignment with China's Belt and Road. Türkiye and China signed a memorandum in November 2015 to align the Middle Corridor with the Belt and Road Initiative. Turkish officials say the arrangement complements, not replaces, other routes and rests on mutual benefit.
• Turkic and regional cooperation. At OTS summits, Turkish leaders have called for harmonized customs, digital documents and joint transport investments among member states. The 2021 Shusha Declaration between Türkiye and Azerbaijan also reaffirms close cooperation on transport and energy. Ankara links these ties to the Treaty of Kars (1921), which established the status of Nakhchivan and remains a reference point in Turkish and Azerbaijani statements on connectivity to the Nakhchivan exclave. Turkish and Azerbaijani officials have discussed a Kars-Iğdır-Nakhchivan rail link as part of wider regional connectivity.
• An inclusive, multi-route approach. The Turkish Ministry of Foreign Affairs describes Türkiye's policy as seeking cooperation with all neighbors on trade and energy. Ankara also promotes the Iraq-Türkiye Development Road. President Erdoğan has said publicly that a Eurasian corridor project that bypasses Türkiye would lack a sound geographic basis, a response to the 2023 IMEC announcement. Ankara argues that the Middle Corridor and southern projects can be complementary rather than rival.

Legal and historical basis

Türkiye's position rests on a set of concrete instruments: the 2007 BTK agreement; the 2015 Belt and Road alignment memorandum; bilateral transit and customs agreements with Azerbaijan and Georgia; and OTS declarations. On the Black Sea leg, shipping through the Turkish Straits remains governed by the 1936 Montreux Convention; see The Montreux Convention Explained: Turkish Straits and Black Sea Security. Türkiye's pipeline role in the same region is covered in Türkiye as an Energy Hub: Pipelines, Corridors and Transit Routes Explained and TurkStream and TANAP Explained: How Gas Reaches Europe Through Türkiye.

Other views Ankara's account leaves out

Independent analysts, including the World Bank, note that the corridor's competitiveness depends less on political declarations than on Caspian capacity, harmonized tariffs and predictable transit times. Some observers also point out that Türkiye competes with Georgia and others for transit revenue and port share, and that infrastructure delivery has sometimes lagged announcements. These points are consistent with Turkish officials' own calls for further investment and harmonization.

Source Comparison

Different sources frame the Middle Corridor through different priorities. The table below summarizes the main patterns.

Source type	Typical framing	Strengths	Limits
EU institutions (European Commission, Global Gateway documents)	Connectivity, resilience and diversification away from Russian transit	Detailed financing and policy frameworks	Policy ambitions are not the same as delivered capacity
World Bank and multilateral development banks	Technical analysis of bottlenecks, costs and reforms needed to scale volumes	Data-driven; identifies specific barriers	Projections depend on assumed investments and policy reforms
Western media and think tanks	Geopolitical alternative to Russia and Suez; sometimes sceptical about actual volumes	Good on sanctions and security context	Can underplay Central Asian and Turkish agency or overstate short-term shifts
Turkish official sources (Ministry of Transport and Infrastructure, Presidency, MFA)	Strategic hub, partnership with Turkic states, complementarity with China's Belt and Road	Primary source for Turkish investments, agreements and policy intent	Official promotional tone; volume claims should be checked against independent data
Chinese official sources	One of several Belt and Road routes, with emphasis on diversified multi-route connectivity	Clarity on Beijing's priorities	Rarely singles out the Middle Corridor as the preferred route
Russian official sources	Emphasis on Northern Corridor and INSTC; limited commentary on the Middle Corridor	Reflect Russian planning priorities	Limited direct engagement with Middle Corridor specifics

How to read the figures. Corridor statistics often differ because sources count different cargo types, use TITR membership or geography as the boundary, or compare against different baselines. Treat percentage growth claims with care, since a rise from a small base can look dramatic. For a broader discussion of claims about Türkiye in the international press, see Fact Check: Common Claims About Türkiye in International Media. Our sourcing standards are set out in Editorial Principles and Primary Source Standards.

What to watch

• Caspian capacity. New vessels, port expansion at Alat, Aktau and Kuryk, and scheduling coordination.
• Harmonized tariffs. Progress toward a single-window booking and through-rate system among TITR members.
• BTK utilization. Whether traffic rises toward design capacity and how gauge-change facilities perform.
• EU financing delivery. Whether Global Gateway pledges become signed projects.
• Regional connectivity in the South Caucasus. Talks on new links through the region, including routes involving Armenia and Nakhchivan, and the effect of the Armenia-Azerbaijan peace process.
• Red Sea and Russia-related developments. Shipping security in the Red Sea, and sanctions and transit policy affecting the Northern route.

Key Terms & Related Guides

• Middle Corridor / TITR. The Trans-Caspian International Transport Route, a multimodal route from China and Central Asia to Europe via the Caspian Sea, the South Caucasus and Türkiye.
• BTK (Baku-Tbilisi-Kars). The railway, opened in 2017, linking Azerbaijan, Georgia and Türkiye. See also TurkStream and TANAP Explained for the parallel energy infrastructure in the region.
• TRACECA. An EU-supported programme launched in 1993 to promote transport links between Europe, the Caucasus and Central Asia.
• Northern Corridor. The land route from China through Kazakhstan, Russia and Belarus to the EU, historically the busiest China-Europe rail path.
• INSTC. The International North-South Transport Corridor, linking India, Iran, the Caspian region and Russia.
• IMEC. The India-Middle East-Europe Economic Corridor, announced at the 2023 G20 summit as a rail-and-sea concept.
• Development Road. A proposed Iraq-Türkiye road and rail project from Iraq's Gulf coast to the Turkish border, backed by Qatar and the UAE.
• Organization of Turkic States (OTS). A political and economic cooperation body of Azerbaijan, Kazakhstan, Kyrgyzstan, Türkiye and Uzbekistan, with Hungary, Turkmenistan and the TRNC as observers.
• Gauge break. The point where railways of different track widths (1,520 mm and 1,435 mm) meet and cargo must be transshipped or axles changed.
• Multimodal transport. Moving cargo under one contract using more than one mode, such as rail, ship and truck.

Related guides

• The Montreux Convention Explained: Turkish Straits and Black Sea Security
• The Black Sea Grain Initiative: How It Worked and Why It Ended
• Türkiye as an Energy Hub: Pipelines, Corridors and Transit Routes Explained
• Eastern Mediterranean Maritime Jurisdiction: Continental Shelf, EEZ and the Blue Homeland
• Doctrinereview FAQ: Sources, Methodology and Perspective
• About Doctrinereview: Mission, Transparency and Editorial Team
• Doctrinereview: Energy, Climate and Corridor Diplomacy Explained

Perspective Note

Doctrinereview presents global and regional affairs with a dedicated perspective from Türkiye. Sections marked 'Türkiye's Strategic Position' reflect official Turkish policy as stated by Turkish government sources.

By the Doctrinereview Editorial Team.

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