The Investment Map of the Future | #05 THE OTHER SIDE OF THE MOUNTAIN IS MOVING CLOSER TO THE PORT THE DÖRTYOL–HASSA TUNNELS AND THE GEOGRAPHY OF PRODUCTION
Beyond a Road: Connecting Two Economies
To the west of the Amanos Mountains lie the ports, iron and steel plants and heavy industry of the Gulf of İskenderun; to the east lie the production areas of Gaziantep, Kilis and Southeastern Anatolia. The central significance of the Dörtyol–Hassa project lies in its aim to reduce the transport barrier between these economic areas.
The Ministry of Transport and Infrastructure (UAB) describes the project as an investment that will connect the Port of İskenderun to the Middle Corridor. Yet a corridor appearing on a map is not the same as a corridor economy developing around it. From a real estate perspective, the question to investigate is which economic behaviours might change.
What Stage Has the Dörtyol–Hassa Project Reached?
An official announcement dated 2 September 2025 reported that €1.55 billion in external financing had been secured for the project. On 20 February 2026, it was announced that site establishment had been completed and tunnel excavation and construction works would begin. The project envisages a total of 55 km of railway, 25 km of motorway and three tunnel tubes, each approximately 20 km long; one tube is allocated to rail and two to road transport.
Source: UAB — Dörtyol–Hassa financing announcement, 2 September 2025
The reduction of approximately 157 km cited in the 20 February announcement is the sum of the reductions across different road and rail routes. It does not mean that a single Gaziantep–İskenderun journey will become 157 km shorter.
The announcement dated 31 May 2026 lists the project among investments under construction, while stating that mobilisation is continuing, route optimisation has been completed, and land acquisition and preparation of the tunnel designs are ongoing. This information shows that the project has moved beyond the idea stage; it does not show that it is a completed transport system in operation. The announced construction process and the actual impact on transport must be kept separate in the assessment.
Source: UAB — Travel Time to the Amik Plain to Fall from 1 Hour to 5 Minutes, 31 May 2026
How Could the Port’s Hinterland Change?
A port’s hinterland is the inland economic area with which it exchanges cargo. Easier transport could strengthen the Gulf of İskenderun’s existing production links and expand its accessible hinterland. The possibility here is a change in producers’ conditions of access to the port, rather than the port physically moving.
The 2025 financing announcement envisages annual rail freight capacity of approximately 10 million tonnes for the first stage. This is a capacity target, not a realised transport volume. Its economic significance can be assessed once the line is commissioned and used by producers.
Source: UAB — Dörtyol–Hassa financing announcement, 2 September 2025
This is why I use the phrase ‘the port growing inland’ as an analytical analogy. The port stays where it is; the production area that can reach it economically may expand. This is the change to monitor for Gaziantep, Kilis and the surrounding production centres.
Gaziantep: The Distance Between Production Strength and the Sea
In Gaziantep, the issue is not limited to connecting a production base assumed to emerge in the future to a port. The cost and time required for the existing production base to reach overseas markets are also decisive.
The Ministry of Industry and Technology’s announcement of 3 June 2026 concerning the Şölen facility provides a concrete example of this scale of production: the announcement refers to a $100 million investment, a 70% capacity increase, employment opportunities for approximately 2,000 people and a smart warehouse with capacity for 30,000 pallets. The employment figure should not be read as 2,000 net new hires.
A facility of this kind does not provide a reason to purchase surrounding land. What it demonstrates is that production, storage and shipping needs already exist east of the mountains. The project should be assessed not only by the number of vehicles expected to use it, but also by the change it could bring to producers’ access to the port.
Kilis: The Second Link in the Connection
UAB’s announcement of 7 March 2026 stated that design work had begun on the connection extending from the Musabeyli Junction towards Dörtyol. The aim is to connect Kilis to the Port of İskenderun and the Mediterranean through the Amanos tunnels.
Source: UAB — Kilis Will Reach the Mediterranean, 7 March 2026
The distinction between stages matters here: the construction process announced for Dörtyol–Hassa and the design work for the Kilis connection are not at the same level of maturity. Showing both with the same line on a map should not create the impression that the connections are ready for use at the same time.
Hassa: From Transit Point to Logistics Node?
A road passing through a place is not enough, on its own, to create a logistics centre. Freight, warehousing, handling, energy, planning, labour and commercial demand must come together in the same location. I therefore regard Hassa as a potential node to be monitored against these conditions, rather than as an already established logistics centre.
The indicators to monitor are concrete: industrial planning, warehouse investments, truck and freight movements, rail freight handling facilities, new commercial uses and changes in land use. The real estate impact can be measured more meaningfully as these links start to materialise on the ground.
Breaking an Economic Barrier: An Analytical Framework
The framework I call ‘Breaking an Economic Barrier’ in this article describes a natural or infrastructural obstacle being significantly reduced through transport investment, allowing areas that remain economically distant to operate within a more integrated production and logistics system. This is not a standard valuation term or a calculated price premium.
The Amanos Mountains remain where they are; Gaziantep does not become a coastal city. What may change is the way freight moves and the economic friction involved. I structure the analysis in four stages: physical barrier → infrastructure intervention → change in logistics behaviour → change in real estate function. Drawing a direct conclusion about prices before the final stage is observed would mean assuming the relationship between them.
In Which Real Estate Functions Should We Look for an Impact?
Marking land near the corridor is not sufficient for investment analysis. Industrial land, warehouses, logistics facilities, truck parking, production sites, commercial service premises, housing and agricultural land may be affected differently by the same connection. Some properties may experience no discernible impact at all.
Proximity to the route must be distinguished from the ability to benefit from the connection. Access, planning and use rights, infrastructure capacity and actual business demand should be examined together. The central question is not only ‘where?’ but ‘for which function and under what conditions?’
The Middle Corridor Dimension: From Potential to Actual Freight
UAB’s consideration of Dörtyol–Hassa in terms of its Middle Corridor connection places the project in a framework that extends beyond the Gaziantep–İskenderun relationship. Southeastern Anatolia’s production, Mediterranean ports and international rail connections are considered together.
The official announcement of 2 June 2026 concerning the Baku–Tbilisi–Kars line states that completion of infrastructure works on the Georgian section marks a new stage in operations. This development is relevant to the Middle Corridor’s connectivity framework; it is not evidence that freight is being carried through Dörtyol–Hassa today.
Source: UAB — Baku–Tbilisi–Kars Support for the Middle Corridor, 2 June 2026
Corridor potential must not be confused with realised freight flows. Property prices cannot be inferred from this connection without observing which cargo is transported, through which terminal and port, and at what cost.
Anadolu Properties’ Perspective: Monitoring the Economics of the Connection
For me, the question is not limited to ‘will land near the tunnel entrance appreciate?’ Is the port used by Gaziantep’s producers changing? How are cargo volumes in the Gulf developing? Are warehousing and handling investments emerging in Hassa? What stage is the Kilis connection moving into? Do expansions of organised industrial zones, new logistics businesses and truck movements support this change? How much freight is the railway actually carrying?
The monitoring sequence should be: tunnel → connection → freight → investment → function → real estate. Progress in the first link does not automatically guarantee the outcome in the last. For readers assessing investments in Türkiye remotely, verifying this chain on the ground is also more informative than proximity on a map.
Before a New City, a Changing Hinterland
Sometimes transport investment changes the economic hinterlands of existing cities more than it creates a new city. The Dörtyol–Hassa project likewise calls for the ports of the Gulf of İskenderun and the production geography of Gaziantep–Kilis–Hatay to be considered together from this perspective.
The two sides of the mountains may move closer economically. Yet the real estate implications of this convergence are measured through use, demand and actual connections, rather than simply proclaimed.
A tunnel does more than cut through a mountain. If it changes the direction of freight, production and investment, it also cuts through the boundaries of economic geography.
This article is intended for general information and research. Project stages are presented within the context of official announcements bearing the dates stated. Proximity to a route does not guarantee appreciation; planning, ownership, agricultural and conservation conditions, expropriation, connection options, infrastructure capacity, demand for use and liquidity must also be assessed at parcel level.
Mustafa Yılmaz
CEO – Anadolu Properties
Europe–Türkiye Investment Bridge
