The Strait of Hormuz
The strait carries oil equal to about a fifth of world petroleum liquids consumption and about a fifth of traded liquefied natural gas, and the pipelines around it hold only some 2.6 million barrels a day of spare capacity, which makes control of passage a lever long before the strait is fully closed.

The Strait of Hormuz is the sea passage between Iran and Oman that connects the Persian Gulf to the Gulf of Oman and the Arabian Sea. At its narrowest it is about 33 kilometres across. The US Energy Information Administration puts average oil flows through it at about 20 million barrels a day in 2024, roughly a fifth of world consumption of petroleum liquids. Around a fifth of globally traded liquefied natural gas took the same route that year, almost all of it Qatari.
Closing a chokepoint is not the only way to use one. The US-Israel war on Iran began on 28 February 2026, and Iran restricted passage to most ships from early March, in what Al Jazeera later called an effective closure. A memorandum of understanding with Washington reopened the waterway on 17 June. About 100 ships a day crossed before the war. In the first 18 days after the reopening, 513 did, on PortWatch figures reported by Al Jazeera. The question at sea is now whose permission a ship needs.
The exposure is not evenly spread. EIA tanker-tracking estimates for 2024 put Saudi Arabian crude and product flows through the strait at about 5.5 million barrels a day, Iraq's at 3.2 million, the United Arab Emirates' at 1.9 million and Kuwait's at 1.3 million. Of the crude and condensate, 84 percent went to Asian buyers, chiefly China, India, Japan and South Korea. Europe took about 0.7 million barrels a day of that crude. EIA notes that even a temporary blockage can raise shipping costs and lift world energy prices.
EIA names only Saudi Arabia and the UAE as having pipelines that move Gulf crude out without passing the strait. Saudi Aramco's East-West line carries 5 million barrels a day of capacity to Yanbu on the Red Sea, and a 1.8 million barrel line takes Emirati crude to Fujairah in the Gulf of Oman. Neither runs full, and EIA estimates only about 2.6 million barrels a day of it would be available in a disruption. Iran's Goreh-Jask line, about 300,000 barrels a day, has loaded nothing since September 2024.
The other way out is north. Ankara and Baghdad renewed the Kirkuk to Ceyhan pipeline deal on 1 August 2026, a one-year arrangement covering 750,000 barrels a day. The line's maximum is about 1.5 million; Turkish data put actual flows near 170,000. None of this settles the law. The Law of the Sea Convention says transit passage through such straits shall not be impeded and shall not be suspended. Iran wants recognised control of its side and a transit fee. Washington and many shipping lines say it must stay free.
”The Omanis are now suggesting three lines for the maritime traffic: one that runs through Iran's territorial waters, an international one, and one through Omani territorial waters”
The numbers
What the comparison shows
Where they agree
Nobody disputes the order of magnitude. The strait carries a fifth of world oil consumption and a fifth of LNG trade, and there is no substitute route on that scale: EIA puts spare pipeline capacity at about 2.6 million barrels a day against roughly 20 million that normally transits. Shipping analysts also agree that the damage starts well before a full closure. Diverted ships burn more fuel and spend longer at sea, which pushes operating costs up, and insurance and war-risk prices rise with them.
Where they split
Two questions split the parties. The first is whether passage through an international strait may be made conditional and priced: Iran says it intends to introduce transit fees when a 60-day transition period ends, while the United States and many shipping lines hold that passage should stay free. Oman has reportedly proposed a middle form, a joint regional mechanism with voluntary fees on the Strait of Malacca model. The second question is whether pipelines can replace the strait: Ankara and Baghdad present the Ceyhan route as a real alternative, while EIA's figures show that spare capacity around the strait is a fraction of the flows.
What nobody is saying
The mines and the insurance. Clearing mines is reported to fall to Iran, but nobody has said when it happens, who verifies that a lane is clear, or what follows if verification never comes. While that is open, the central section of the strait, where the seabed is believed to be most mined, stays largely unused. Nor has anyone set out what war-risk cover for a transit now costs. Premiums on politically exposed routes are said to have risen, but no figure for Hormuz has been published.
Who says what
The strait cannot return to its pre-war state of free-flowing shipping. He rejects Oman's proposal for an equal division of the transit routes, saying it does not address Iran's security concerns, and proposes instead that Iran manage shipping on its own side while Muscat manages part but not all of the opposite lane. Iran, he says, will consider any action to keep control, including a resumption of the war.
Describes the Omani compromise on the table: three separate lanes rather than a split of control, and an Iranian position more flexible behind the scenes than in its public statements.
”The Omanis are now suggesting three lines for the maritime traffic: one that runs through Iran’s territorial waters, an international one, and one through Omani territorial waters”The Omanis are now suggesting three lines for the maritime traffic: one that runs through Iran's territorial waters, an international one, and one through Omani territorial waters
The damage does not begin at closure. Making passage conditional on permission is enough to load costs and uncertainty onto shipping, and the danger is the precedent: if several states test the boundaries with selective enforcement, tolls or levies in international straits, outcomes are settled by bargaining power.
”Even short of a full shutdown, ‘permissioning’ and pressure can impose major costs and uncertainty”Even short of a full shutdown, 'permissioning' and pressure can impose major costs and uncertainty
Cuts against the idea of a break with the old order. Using the sea to squeeze an adversary's economy is as old as naval warfare; what is new is the scale, the container volumes and the size of the world fleet, that is, how much a blockage now costs.
”Maritime action has always been an important aspect to weigh pressure on an enemy’s economy and military – there is nothing new there, but what has changed is the scale, the volume of containers, the size of the global fleet”Maritime action has always been an important aspect to weigh pressure on an enemy's economy and military, there is nothing new there, but what has changed is the scale, the volume of containers, the size of the global fleet
A route around the strait can be built. On 1 August 2026, after a meeting in Ankara with Iraq's oil minister, he announced that a transit arrangement for the Kirkuk to Ceyhan pipeline covering a daily capacity of 750,000 barrels had been implemented, while talks on a long-term agreement continue. The deal, he says, holds a more strategic position given developments in global oil markets.
An institutional counterweight to hopes placed in alternative routes. Most of the volumes that transit the strait have no other way out of the region, and spare capacity in the Saudi and Emirati pipelines runs to about 2.6 million barrels a day against roughly 20 million that normally transits.
”Most volumes that transit the strait have no alternative means of exiting the region, although there are some pipeline alternatives that can avoid the Strait of Hormuz.”Most volumes that transit the strait have no alternative means of exiting the region, although there are some pipeline alternatives that can avoid the Strait of Hormuz.
Our coverage
- Iran says its deal with Oman on the Strait of Hormuz is close to finalFriday, 7 August 2026
- Oman-mediated talks on the Strait of Hormuz continue as Washington signals optimism and Tehran plays downWednesday, 5 August 2026
- Trump gives Iran a last chance and keeps the blockade of its southern portsMonday, 3 August 2026
- Ankara and Baghdad renew the Kirkuk pipeline for a year at 750,000 barrels a daySunday, 2 August 2026
- Trump calls off the attack on Iran, saying the perimeters of a deal are agreedSunday, 2 August 2026
- Türkiye and Iraq sign a one-year deal on the oil pipeline to CeyhanSaturday, 1 August 2026
- Iran says it struck US bases in Kuwait and Bahrain after a new wave of American attacksFriday, 31 July 2026
- US and Iran trade missile barrages as hopes of a quick end fadeThursday, 30 July 2026
- Iraq offers Turkey a million barrels of oil a day while the Strait of Hormuz stays closedWednesday, 29 July 2026
- US joins forces with Saudi Arabia to strike Tehran-backed militias in IraqWednesday, 29 July 2026
- Iran and Oman trade proposals on how the Strait of Hormuz should be runTuesday, 28 July 2026