Why Hormuz gives Iran leverage — but not control.

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We are the Mnemosyne Research Institute. And this is Clio: mapping the constraints that shape our world.

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The Middle East is defined by its chokepoints.

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The Strait of Hormuz is the most consequential waterway on Earth.

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At its narrowest, it spans just 39 kilometers between Iran and Oman.

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Iran controls the entire northern shore.

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Roughly 21 million barrels of oil pass through Hormuz every day — about one-fifth of global consumption.

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That oil flows from the Persian Gulf through the Strait and into the Indian Ocean, bound for Asia, Europe, and beyond.

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Saudi Arabia, the UAE, and Qatar together produce over 15 million barrels per day. Almost all of it exits through Hormuz.

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The United States maintains significant military presence in the region — the Fifth Fleet headquarters in Bahrain, Al Udeid Air Base in Qatar, and facilities across the Gulf.

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But military presence does not eliminate the chokepoint risk. It manages it.

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Alternative routes exist — notably the East-West Pipeline — but they carry a fraction of Hormuz volume.

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And the secondary chokepoints are equally fragile. Bab el-Mandeb, the gate to the Red Sea, is under active threat from Houthi forces in Yemen.

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From Bab el-Mandeb, oil routes continue through the Red Sea to the Suez Canal — another single point of failure.

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Iran does not need to close Hormuz to exercise leverage. The threat of closure is itself a weapon — one that raises insurance premiums, reroutes tankers, and injects risk into global energy markets.

Hormuz gives Iran leverage. But not control. The difference matters.

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Thank you for joining us for this briefing from the Mnemosyne Research Institute. We will see you on the next map.