The Traffic: What Actually Moves Through Hormuz Every Day
Approximately 20 million barrels of oil and petroleum products transit the Strait of Hormuz on an average day. The figure is so large and repeated so frequently in energy commentary that it has become almost abstract. Decomposing it into its constituent flows reveals a more specific picture of what is actually at stake — which countries, which companies, which commodity streams, and which supply chains run through twenty-one miles of contested water.
Crude oil dominates the transit volumes. The major exporters are Saudi Arabia, Iraq, the UAE, Kuwait, and Iran. Saudi Arabia accounts for the largest single share, typically somewhere between six and seven million barrels per day in export volumes that move through the strait. Iraq’s production, almost entirely from the Basra fields in the south, is nearly as dependent on Gulf terminals, with volumes that have grown steadily as the country has expanded production capacity. The UAE, despite its Fujairah bypass capacity, still moves a substantial portion of its exports through Hormuz because the bypass has capacity limits and moving crude to Fujairah adds cost.
LNG has become an increasingly significant element of the strait’s traffic as Qatar has expanded its production capacity at the North Field, the largest natural gas reservoir in the world. Qatar’s LNG is committed under long-term contracts to buyers in Japan, South Korea, China, India, and Europe. These cargoes move through Hormuz on dedicated LNG carriers that are among the largest vessels in the world’s fleet. A Hormuz closure that lasted more than a few weeks would begin to affect LNG delivery schedules in ways that have knock-on effects for electricity generation and industrial gas use in importing countries, many of which have limited alternative supply options for contracted volumes.
The downstream product flows add a dimension that is often overlooked. Refineries in the Gulf — Saudi Arabia, the UAE, Kuwait, and Bahrain all have significant refining capacity — export petroleum products through Hormuz in addition to crude. Jet fuel, diesel, naphtha, and liquefied petroleum gas move outbound alongside crude oil. Inbound, the terminals receive empty tankers returning for loading, along with the commodities — food, manufactured goods, construction materials — that sustain Gulf economies which run large import deficits despite their energy wealth.
The vessel count gives a different perspective on the traffic density. On a typical day, somewhere between fifteen and twenty large crude tankers — VLCCs and Suezmaxes — transit the strait in each direction. Smaller product tankers, LNG carriers, LPG carriers, and general cargo vessels add substantially to the count. The strait has two designated traffic separation zones, each approximately two miles wide, with a two-mile buffer between them. The available maneuvering room for very large vessels is extremely limited. In poor visibility, heavy traffic, or when vessels are deviating from normal lanes to avoid threats, the probability of incidents unrelated to hostile action increases substantially.
The destination breakdown of Hormuz oil flows illustrates the geographic concentration of the stakes. Asia — primarily Japan, China, South Korea, India, and smaller Southeast Asian economies — accounts for well over half of the total volumes. Europe takes a smaller share, supplemented by non-Gulf sources. The United States, which has become a net oil exporter, depends on Hormuz not for its own consumption but for the stability of global prices that affect its own producers and for the security of allies whose dependence on Gulf supply is a treaty obligation in all but name.
Twenty million barrels per day. Roughly a fifth of global oil consumption. The number is not abstract. It is the daily cost of closure, priced in economic disruption that accumulates with every day the corridor is shut.