Why Maritime Chokepoints Are the Real Battleground of Modern Geopolitics

When people think of global conflict, they often think of large infantry crossing borders, tanks rolling through cities, or nations fighting over territory. That theory concurs with what we see today: Russia's invasion of Ukraine is centred on land disputes; Tensions in the South China Sea are focused on territory and sea borders. These lines on the map dominate the conversation.

But what if the kernel of modern geopolitics is not land or lines at all?

Instead, it may lie in narrow strips of water that most people rarely think about. Maritime chokepoints such as the Strait of Hormuz, the Suez Canal and the Strait of Malacca control the movement of enormous volumes of global trade. These locations are barely visible on a map, yet their influence is immense. According to the International Energy Agency, roughly 20% of the world’s oil consumption passes through the Strait of Hormuz alone. This is now having immense effects on the world economy and inflation due to the Iranian blockade. Similarly, the United Nations Conference on Trade and Development estimates that around 80–90% of global trade is transported by sea. When so much economic activity depends on maritime routes, control over these corridors becomes a country's biggest ally.

The reason for this lies in the structure of modern globalisation. Unlike earlier periods of history, today’s economies rely heavily on complex international supply chains. Oil passing through the Strait of Hormuz from the Middle East powers' industries across the world, especially Big Oil in the USA, satisfies President Trump's fantasies of Drill, Baby Drill. Manufactured goods produced in Asia are shipped thousands of miles through the Strait of Malacca to Western markets and account for Global dependence on China to sustain economic growth. Raw materials, energy, food and consumer products move continuously across oceans. Without these flows, the modern global economy simply cannot function.

Suez Canal

Because of this dependence, maritime chokepoints create strategic vulnerabilities. The Strait of Hormuz connects the oil-rich Persian Gulf to global markets. The Suez Canal provides one of the fastest routes between Europe and Asia, handling around 12% of global trade. Meanwhile, the Strait of Malacca carries roughly one quarter of the world’s traded goods, making it one of the busiest shipping lanes. When so much economic activity depends on such narrow corridors, even temporary disruption can produce global consequences. This is evident now with the Houthis threatening to close the Suez Canal; the world economy is bound to take another hit as investors pre-empt the effect. This forces the world closer to a recession and slashes Keir Starmer's hopes of cutting inflation and kickstarting economic growth in the UK.

The world was warned earlier in 2021 when this dynamic was demonstrated clearly during the 2021 Suez Canal obstruction, when the container ship Ever Given became lodged across the canal for six days. At its peak, an estimated $9-10 billion worth of trade was delayed each day, according to calculations by Lloyd's List. Or in 2022, when Russia invaded Ukraine, and gas prices soared. Or even the Suez Crisis of '64, when the UK and France tried to reopen the Canal after it was closed by Nasser. Even the thought of any form of hindrance in any of these chokepoints affects supply chains and global markets. This shows that in the modern economy, geography still matters, but not always in the way people expect.

Strait of Hormuz

This is why these sea-based trade routes are such powerful geopolitical pressure points. States located near these routes possess leverage that often exceeds their conventional military strength. They may not need to defeat stronger powers directly. Instead, they can threaten the systems that stronger powers rely upon.

Iran provides one of the clearest examples of this dynamic. In purely military terms, Iran is significantly weaker than the United States and its allies. However, its geographic position along the Strait of Hormuz gives it an important strategic advantage. Even limited tensions in the region have historically caused oil prices to surge. Energy analyst Daniel Yergin argues that the Strait of Hormuz functions as “the world’s most important oil transit chokepoint.” Iran does not necessarily need to block the strait entirely to exert influence, as even the mere possibility of disruption can increase shipping costs and introduce uncertainty into global energy markets.

Major powers are acutely aware of this vulnerability. The United States Navy maintains a substantial presence in the Persian Gulf largely to guarantee freedom of navigation. Moreover, they are calling on their NATO allies to help reopen the Strait of Hormuz from Iranian control. A call which is not being answered is a cause of worry for the future of NATO. Meanwhile, China has expanded its naval reach significantly over the past two decades, reflecting its growing dependence on maritime trade routes, which have been the engine for its booming economy. According to the Stockholm International Peace Research Institute, China’s naval fleet is now the largest in the world by number of vessels — an expansion driven in part by the need to protect critical shipping lanes.

These precedents reflect a broader shift in modern geopolitics. Historically, power was measured primarily through landmass or the size of a nation’s army. Today, economic networks, trade and supply chains play an equally important role. Geopolitical scholar Alfred Thayer Mahan famously argued over a century ago that control of sea lanes can determine the balance of global power. In the twenty-first century, that insight appears increasingly relevant.

However, maritime chokepoints have not replaced traditional forms of power politics completely. Territory, alliances and technological superiority are still crucial, such as the ever-stagnant Space Race. But maritime trade routes represent an additional layer of strategic competition, one that operates primarily through economic leverage rather than direct military confrontation and benefits those who control these chokepoints.

This reveals one of the central paradoxes of globalisation. The interconnected economic system that we live in today has produced unprecedented prosperity and a surge in growth, but it has also created new dilemmas. When global trade depends on a small number of corridors, instability in a single region can affect the entire world economy.

Ultimately, this is why maritime chokepoints have become such critical battlegrounds in modern geopolitics. States no longer need to control vast territories to exert influence. Sometimes controlling or simply threatening a narrow stretch of water is enough.

So, while maps and borders are still the forefront of politics, another player is becoming increasingly important, and this player lies in the thin blue lines through which the world’s commerce flows.