Strait of Hormuz
The Strait of Hormuz is a narrow waterway between Iran and Oman connecting the Persian Gulf to the Gulf of Oman and the Arabian Sea. It is the world's most strategically critical oil chokepoint, through which roughly 20 percent of global oil supply passes daily. Iran's ability to threaten or close the strait gives it enormous leverage over the global economy.
The strait is approximately 33 kilometers wide at its narrowest point, with shipping lanes only a few kilometers wide on each side. This extreme narrowness, combined with the fact that the Iranian coastline runs directly along the northern edge, means that Iran can project military force, including mines, missiles, and fast attack boats, across the entire waterway with relatively modest capabilities. The 2002 Millennium Challenge war game demonstrated that Iran could disable or sink major US naval vessels operating in the strait using cheap asymmetric tactics.
About 17 to 21 million barrels of oil pass through the Strait of Hormuz every day, representing roughly 20 to 21 percent of global petroleum consumption. Japan imports approximately 75 percent of its oil through this chokepoint. South Korea, China, and India are also heavily dependent on it. This dependency makes the strait the single most important geographic feature in global energy security, and its closure or disruption would trigger immediate economic shock across Asia and Europe.
During the Iran-Iraq War in the 1980s, both sides attacked tankers in what became known as the Tanker War, causing massive insurance rate spikes and requiring US naval escorts. Iran has repeatedly threatened to close the strait during periods of US-Iran tension, including in 2008, 2012, and the ongoing 2026 conflict. Because the threat is credible and the consequences catastrophic, the strait functions as Iran's primary strategic deterrent against American military action.
The geopolitical importance of the strait extends beyond oil. Liquefied natural gas, phosphate, ammonia, urea, sulfur, and helium, all critical for fertilizer and semiconductor production, also flow through the strait. A prolonged closure would therefore affect not just energy supplies but global food production and high-technology manufacturing, making it a lever capable of destabilizing the entire modern global economy.
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Frequently asked questions
Why is the Strait of Hormuz so strategically important? ＋
About 20 percent of global oil supply passes through the strait daily, along with critical commodities like LNG, fertilizer inputs, and semiconductor materials. Japan gets 75 percent of its oil through it. Iran sits directly on its northern coast, meaning it can threaten or mine the entire waterway, giving Tehran enormous leverage over Asia and Europe even without a large conventional navy.
Can Iran actually close the Strait of Hormuz? ＋
Iran cannot permanently close the strait against a determined US naval force, but it can make transiting the strait extremely costly and dangerous. Mines, coastal missiles, drone swarms, and fast attack boats can sink tankers and disable warships. The 2002 Millennium Challenge war game showed Iran-style tactics could sink 16 US ships in hours, demonstrating that the threat of closure is entirely credible as a deterrent.