The Strait of Hormuz is one of the most strategically important waterways in the world. In a war involving Iran, it could become the single biggest disruption point for global energy supplies, because a huge portion of the world’s oil must pass through this narrow passage.
Below is a clear explanation of how a conflict with Iran could shut down about 20% of the world’s oil supply.
1. The Strait of Hormuz Is a Global Energy Chokepoint
The strait lies between Iran and Oman, connecting the Persian Gulf to the open ocean.
Its strategic importance comes from the amount of energy that flows through it.
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Around 20 million barrels of oil per day pass through the strait.
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That equals roughly 20% of global oil consumption.
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About 20% of global liquefied natural gas (LNG) also passes through the route.
Major oil exporters relying on this route include:
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Saudi Arabia
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Iraq
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Kuwait
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United Arab Emirates
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Iran
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Qatar
If shipping stops, much of this oil cannot reach global markets quickly through other routes.
2. The Strait Is Extremely Narrow
Although it carries a huge portion of the world’s energy, the strait itself is very small.
Key facts:
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Total width: about 33–39 km
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Shipping lanes: only about 3 km wide in each direction
This narrowness makes the strait easy to disrupt or control militarily.
A few ships, mines, or attacks could halt traffic.
3. Iran’s Geographic Advantage
Iran controls the northern coastline of the strait and has many nearby islands and military bases.
This allows Iran to deploy:
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anti-ship missiles
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naval mines
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fast attack boats
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drones
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coastal radar systems
From the Iranian coast, these weapons can cover almost the entire shipping lane.
In military terms, this is called “area denial” — making a region too dangerous for ships to enter.
4. Naval Mines Could Block Shipping
One of the simplest ways to shut the strait is naval mines.
Mines are small underwater explosives that detonate when ships pass nearby.
Why mines are effective:
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cheap and easy to deploy
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difficult to detect
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slow to remove
Even a small number of mines could force shipping companies to stop sending tankers until the area is cleared.
Mine-clearing operations can take weeks or months.
5. Missile and Drone Attacks on Tankers
Iran has developed large numbers of:
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anti-ship missiles
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armed drones
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coastal artillery
These systems could strike:
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oil tankers
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escort ships
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ports and terminals
If even a few tankers are destroyed, insurance companies may refuse to cover ships entering the region.
Without insurance, most commercial vessels will not sail through the strait.
6. Fast Attack Boat Swarms
Iran’s naval doctrine emphasizes swarm tactics.
Instead of large warships, it uses:
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dozens of small speedboats
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rockets and anti-ship missiles
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suicide drones
These boats can quickly approach large tankers and warships.
Swarm attacks are difficult to defend against because many targets appear simultaneously.
7. Even Fear Alone Can Shut the Strait
In practice, the strait doesn’t have to be physically blocked to stop oil shipments.
If tankers believe they might be attacked:
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ships stop entering the region
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insurance costs skyrocket
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shipping companies halt operations
Recent disruptions show how quickly this can happen.
Energy analysts warn that severe disruption could push oil prices above $100 per barrel.
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Hundreds of oil tankers have reportedly been stranded during escalating conflict.
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Shipping traffic in the strait has dropped dramatically during regional tensions.
Even partial disruption can trigger global economic shocks.
8. Alternative Routes Are Limited
Some pipelines bypass the strait, but they cannot replace its capacity.
Examples include pipelines through:
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Saudi Arabia to the Red Sea
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UAE to the Gulf of Oman
However, these routes can only carry a fraction of the oil normally shipped through Hormuz.
That means a closure would still remove millions of barrels per day from global supply.
9. Who Would Be Hit the Hardest
Countries most dependent on oil passing through the strait include:
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China
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India
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Japan
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South Korea
Together they receive the majority of crude shipments moving through Hormuz.
This means disruption would mainly affect Asian energy security.
10. Global Economic Impact
Closing the strait would cause several immediate effects:
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Oil prices spike worldwide
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Energy shortages in Asia
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Shipping disruptions across global trade
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Inflation in many economies
Analysts often compare the potential shock to major historical oil crises.
In simple terms:
Because about one-fifth of the world’s oil passes through a narrow waterway next to Iran, a war involving Iran could quickly disrupt global energy supplies if that route becomes unsafe.
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