Photo: US Navy, public domain (via Wikimedia Commons).
On a map, it looks insignificant: a narrow strip of water, about 33 kilometers wide at its tightest point, between Iran and the Arabian Peninsula. Yet the Strait of Hormuz is arguably the most important waterway on Earth. Roughly a fifth of the world's oil and a similar share of its liquefied natural gas pass through it every day. When tensions rise there, oil prices jump within hours — as markets have seen repeatedly during the current conflict.
Why is this strait so important?
The Persian Gulf is home to some of the largest oil and gas producers on the planet: Saudi Arabia, Iraq, Kuwait, Qatar and the United Arab Emirates. Almost all of their exports leave by tanker, and almost every tanker must pass through Hormuz. There is no practical alternative route for most of this energy — pipelines bypassing the strait carry only a fraction of the volume. Energy analysts often describe Hormuz as a "chokepoint": a place where global trade depends on a passage so narrow that a single crisis can disrupt it.
Who controls it?
Iran borders the strait's northern shore and has long treated it as strategic leverage. Iranian forces have harassed, seized and attacked shipping in past crises, and Tehran periodically threatens to close the strait entirely when confronted by the United States or its allies. Oman controls the southern shore, and the US Navy's Fifth Fleet, based in Bahrain, patrols the region to keep the route open. The result is a permanent stand-off: the waterway stays open because all sides know what closing it would cost — including Iran, whose own oil exports depend on the same passage.
What would happen if it closed?
Even a short closure would be an economic shock. Oil prices would likely spike far above recent highs, because the missing supply could not be quickly replaced. Gasoline and diesel prices in the United States and Europe would follow within weeks, along with higher costs for air travel, shipping and food. Insurance rates for tankers would soar, and some shipping companies would refuse the route even before any formal closure. In past crises, prices have jumped on threats alone — the mere expectation of disruption is enough to move markets.
Why does it keep coming back in the news?
Because the strait sits at the crossing point of energy, war and diplomacy. Every escalation between Iran and its adversaries — missile strikes, tanker seizures, threats against shipping — immediately raises the question of whether Hormuz is next. That is why a recent report that ships came under attack in the strait in record numbers in a single month sent oil above $117 a barrel: traders were not only pricing the attacks themselves, but the risk of what could follow.
The bottom line
Hormuz matters because the world economy runs through it. As long as a fifth of global energy supplies must squeeze through a channel narrower than many cities, events in this small stretch of water will keep shaping prices at gas stations thousands of kilometers away.