Where the World Narrows™
From the Mediterranean to the Caspian
To understand the times, we must first understand the map.
- Mediterranean
- Aegean
- Dardanelles
- Sea of Marmara
- Bosphorus
- Black Sea
- Caucasus
- Caspian
- Central Asia
Understanding the times — and knowing what to do — requires us to understand the geography upon which events unfold: its constraints, its vulnerabilities and its opportunities.
Technology can shorten distance. Capital can cross borders in seconds. Political leaders can announce new strategies and businesses can redesign supply chains.
But none of them can move the Bosphorus.
None can remove the Caucasus.
None can turn the Caspian into an ocean.
And none can wish away the governments, treaties, borders and competing interests through which people, goods, energy and military power must pass.
That is why geography still matters.
Stand at the eastern end of the Mediterranean and look north-east.
The map appears, at first, to offer a route.
Through the Aegean. Into the Dardanelles. Across the Sea of Marmara. Through the Bosphorus. Into the Black Sea. Across Georgia and Azerbaijan. Then over the Caspian and into the immense spaces of Central Asia.
But look more closely.
It is not simply a route.
It is a succession of gates.
And whoever understands the gates begins to understand a great deal about commerce, war, sanctions, energy, supply chains — and the changing relationship between Europe and Asia.
For centuries, goods, armies, beliefs and ideas have moved through this territory. What we now rather neatly call the Silk Roads were never one road. They were a shifting network. Political hostility closed one route and merchants found another. Empires taxed them, protected them, fought over them and occasionally tried to close them.
UNESCO records that Roman merchants seeking to avoid their Parthian adversaries used routes northward across the Caucasus and Caspian.
There is something wonderfully contemporary about that.
When one route becomes dangerous, expensive or politically unacceptable, commerce looks for another.
That is happening again.
Dardanelles · Sea of Marmara · Bosphorus
THE FIRST GATE: TÜRKİYE
The Mediterranean does not simply become the Black Sea.
To get there by ship, one must pass through Türkiye.
The Dardanelles narrow the journey first, leading into the Sea of Marmara. The Bosphorus then narrows it again before opening suddenly into the Black Sea.
This geography gives Türkiye an importance which no amount of satellite communications, air freight or digital commerce has abolished.
But geography here is reinforced by law.
The 1936 Montreux Convention governs passage through the Turkish Straits and gives Türkiye a distinctive role in administering the movement of warships between the Mediterranean and Black Sea.
The distinction that matters is between Black Sea states and states that do not border the Black Sea.
Britain and the United States may be NATO allies of Türkiye. Their navies are among the most capable in the world. But neither is a Black Sea state.
They therefore cannot simply place naval forces in the Black Sea indefinitely.
Under Montreux, warships belonging to states that do not border the Black Sea face restrictions on tonnage, notification and duration. Most strikingly, they may remain in the Black Sea for no more than 21 days.
Aircraft carriers cannot pass through the Straits at all. Submarine passage is tightly constrained and principally reserved to Black Sea states under specified circumstances.
That changes how one should look at the map.
NATO has three members on the Black Sea — Türkiye, Bulgaria and Romania — but its two greatest Atlantic naval powers cannot treat those waters as they would the North Atlantic or Mediterranean. Bulgaria and Romania are also full members of the European Union; Türkiye, although a longstanding NATO ally and closely tied to the EU economically and strategically, remains a formal candidate rather than an EU member.
The Black Sea is connected to the world's oceans.
But it is not simply another part of them.
Black Sea
THE BLACK SEA: AN OPENING THAT CAN ALSO BECOME A WALL
Continue north and the confined waters of the Bosphorus suddenly give way to something much larger.
The Black Sea touches Türkiye, Bulgaria, Romania, Ukraine, Russia and Georgia.
For commerce it is a highway.
For Ukraine it has been a lifeline.
For Russia it is a theatre of military power.
For NATO it is a strategic frontier.
And for those seeking to enforce sanctions, it forms part of a much larger problem: how do you police commerce in a world in which ships, cargoes, companies, flags, insurers, banks and beneficial owners may all belong to different jurisdictions?
The answer is: with difficulty.
Russia's invasion of Ukraine has created an elaborate contest between sanctions and circumvention. Ships change ownership. Trading entities appear in third countries. Payments move through intermediaries. Cargoes are transferred, blended, relabelled or rerouted.
The European Union has already sanctioned hundreds of vessels it associates with Russia's so-called shadow fleet, as well as operators, traders and other entities connected with it.
This matters far beyond oil.
Because once we begin following a ship, a container, a payment or a component rather than merely looking at the flag painted on the stern, the map becomes much more complicated.
Caucasus
THEN THE ROAD TURNS EAST
From the eastern Black Sea, another geography begins.
Georgia provides the bridge into the South Caucasus. Azerbaijan leads towards the Caspian. Across that sea lie Kazakhstan and Turkmenistan — and beyond them the wider markets and manufacturing centres of Central and East Asia.
Today policymakers call one version of this network the Trans-Caspian Transport Corridor, or Middle Corridor.
The terminology is new.
The instinct is ancient.
These lands have connected civilizations for millennia.
The Silk Roads linked China, Central Asia, the Indian subcontinent, Persia, the Caucasus, the Mediterranean and Europe through a changing network of caravan tracks, mountain passes, river crossings, ports and trading cities.
Goods moved.
So did religions.
So did languages, technologies, diseases, armies and ideas.
And the routes changed whenever politics demanded it.
That history suddenly matters again.
For decades, much overland Asia-Europe trade could travel through Russia. Russia's war against Ukraine and the sanctions which followed changed the strategic calculation. Businesses and governments began looking more seriously at routes which could connect Central Asia and Europe without depending upon Russian territory.
The result is renewed attention to the old east-west axis through Kazakhstan, the Caspian, Azerbaijan, Georgia and Türkiye — with connections across the Black Sea and onwards into Europe.
This is no longer a cartographer's curiosity.
In September 2026, the World Bank estimated that properly integrated investment in the Trans-Caspian corridor could more than triple trade volumes by 2040, while substantially reducing journey times.
Railways matter again.
Ports matter.
Border crossings matter.
Ferries across the Caspian matter.
So do customs systems, cranes, rolling stock, roads, digital documentation and the ability of several sovereign states to make one container's journey feel like a single journey rather than a succession of bureaucratic adventures.
Globalisation has not abolished geography.
It has rediscovered it.
Caspian · Central Asia
THE CASPIAN: NOT THE END OF THE JOURNEY
Reach Baku and the land gives way once more to water.
Across the Caspian sit Kazakhstan and Turkmenistan. Beyond them lie Uzbekistan, Kyrgyzstan and Tajikistan; further east, China.
Look south and Iran enters the calculation.
Look north and Russia never disappeared from it.
The Caspian therefore does not mark the end of our journey.
It marks another hinge.
And here commerce begins to collide with a more uncomfortable question.
What, exactly, are we carrying west?
Not simply which goods.
Under what conditions were they made?
By whom?
From which raw materials?
Using whose labour?
And can the company ultimately selling the product prove the answers?
FROM THE FACTORY FLOOR TO THE SHOP WINDOW
That question takes us beyond geopolitics and into human dignity.
Western businesses have spent years discovering just how difficult it can be to know every layer of a modern supply chain.
A European fashion house may know the factory sewing a garment.
Does it know where the thread was spun?
Where the cotton was grown?
Who picked it?
A manufacturer may know its direct supplier.
Does it know the supplier's supplier?
Or where the aluminium, silicon, electronic component or raw material entering that supplier's product originated?
These are no longer theoretical questions.
The United States has established a legal presumption against imports produced wholly or partly in Xinjiang, or by listed entities, because of forced-labour concerns. The U.S. Department of Labor identifies goods ranging from cotton, textiles and garments to polysilicon, aluminium and automotive inputs in its work examining forced labour connected with Xinjiang.
Elsewhere the picture must be drawn with equal care rather than broad accusation. Uzbekistan, for example, has made substantial progress: the International Labour Organization reported the end of systemic child and forced labour in its cotton harvest. Turkmenistan continues to work with the ILO and European Union on concerns surrounding labour conditions, child labour and forced labour in its cotton sector.
Countries change.
Practices change.
Supply chains change.
That is precisely why due diligence cannot be performed once and placed in a filing cabinet.
SAFE PORTS
And that brings us back to geography.
Businesses once designed supply chains overwhelmingly around efficiency.
Where can this be made most cheaply?
How quickly can it arrive?
How little inventory must we hold?
Those remain legitimate questions.
They are no longer sufficient.
Boards increasingly have to ask:
Where does this pass?
Who controls that passage?
What happens if sanctions change?
What happens if war closes the route?
What happens if our supplier's supplier is dependent upon an adversary?
Can we trace the labour that produced it?
Can we trace the money that paid for it?
And if challenged tomorrow by a regulator, shareholder, customer or journalist, could we demonstrate that we knew?
This is where geopolitics ceases to be something discussed at conferences and begins appearing in procurement meetings.
Supply-chain resilience is becoming part of corporate statecraft.
Diversification away from strategic dependence need not mean withdrawing from Asia. Nor should legitimate concern about labour conditions become a lazy indictment of entire countries and peoples.
It means knowing.
Knowing where goods originate.
Knowing who controls critical suppliers.
Knowing which jurisdictions a shipment crosses.
Knowing where legal and sanctions exposure lies.
Knowing whether workers have been exploited.
And knowing which alternative ports, suppliers and corridors exist before they are urgently needed.
THE OLD MAP, REDISCOVERED
Perhaps that is the lesson of this journey.
From the Mediterranean through the Turkish Straits, across the Black Sea, through the Caucasus and over the Caspian, we have travelled through territory that Western attention had, for a time, allowed to recede towards the edges of the map.
It was never peripheral to the people who live there.
And it was never truly peripheral to world trade.
The merchants of antiquity understood something we are having to learn again.
There is no such thing as a supply chain without geography.
Mountains still channel movement.
Straits still narrow it.
Ports still enable it.
Wars still divert it.
Governments still regulate it.
Unscrupulous actors still attempt to conceal what is moving and where it came from.
And human beings still stand somewhere near the beginning of almost everything we eventually buy.
That last point may be the most important.
A container is not merely a container.
Somewhere behind it is a mine, field, factory, refinery or workshop.
Somewhere there are workers.
Somewhere there is an owner.
Somewhere there is a government.
And somewhere there is a decision about what we are prepared to buy, finance, transport or overlook.
The old Silk Roads carried more than silk.
Today's corridors carry more than containers.
They carry interests, dependencies, values and choices.
Understanding where the world narrows therefore tells us more than where power lies.
It begins to tell us what responsible people should do about it.
That makes the journey from the Mediterranean to the Caspian not an excursion into an unfamiliar corner of the map.
It makes it a journey into our times.
