Crude oil chokepoints: the routes global supply depends on
Crude oil is the largest traded commodity on earth by value, and the one whose supply chain concentrates in the fewest places. The world consumed about 105.2 million barrels per day in 2025, three countries produced 39% of it, and roughly 80 million barrels a day of that supply moved by sea through a short list of straits and canals.
That concentration is usually an abstraction. In 2026 it became measurable. After the war against Iran began in late February and traffic through the Strait of Hormuz effectively halted, global oil supply fell 10.1 mb/d in March alone, to 97 mb/d, which the IEA called the largest disruption in history. Cumulative losses reached 12.8 mb/d by April. Dated Brent passed US$140, its highest since 2008.
The lesson of that episode is the organising idea of this page. Oil is abundant geologically and fungible commercially, but its transport is neither. Production can be replaced over years; a strait cannot be replaced at all.
Key numbers
| Metric | Value | Source | As of |
|---|---|---|---|
| World oil demand | 105.2 mb/d | IEA / compiled | 2025 |
| World maritime oil trade | 79.8 mb/d | EIA | 1H 2025 |
| Largest producer: United States | 13.58 mb/d (16%) | EIA | 2025 |
| Russia | 9.87 mb/d | EIA | 2025 |
| Saudi Arabia | 9.51 mb/d | EIA | 2025 |
| Share from top three producers | 39% | EIA via Visual Capitalist | 2025 |
| Share from top ten producers | >72% | EIA via Visual Capitalist | 2025 |
| Middle East share of global crude output | 32.1% | EIA via Visual Capitalist | 2025 |
| Supply change, March 2026 | -10.1 mb/d, to 97 mb/d | IEA Oil Market Report | Apr 2026 |
| Cumulative supply losses, Feb to Apr 2026 | 12.8 mb/d | IEA Oil Market Report | May 2026 |
| Global observed inventories | >8.2 bn bbl, highest since Feb 2021 | IEA | Mar 2026 |
| IEA emergency reserve release | 400 mn bbl | IEA member decision | Mar 11, 2026 |
| Brent, peak of the 2026 shock | >US$140/bbl (dated), highest since 2008 | Trading Economics | Mar 2026 |
| Brent, current | ~US$79/bbl | Trading Economics | Aug 5, 2026 |
Supply: who produces crude oil
Production concentrates at the top and thins out fast. The United States led 2025 at 13.58 mb/d, about 16% of global output, roughly a quarter of it from the Permian Basin. Russia followed at 9.87 mb/d and Saudi Arabia at 9.51 mb/d. Those three alone accounted for 39% of world production. Canada came fourth at 4.94 mb/d, then Iraq at 4.39, China at 4.34, Iran at 4.19, the UAE at 3.82 and Kuwait at 2.58. The top ten supplied more than 72% of global output.
Two features of that list matter more than the ranking. First, five of the top ten producers sit in the Middle East, together contributing 32.1% of world crude, and nearly all of their exports leave through a single strait. Second, Saudi Arabia is the only producer that routinely holds meaningful spare capacity, which is what allows it to add or withdraw barrels rather than simply pumping what it can. That asymmetry, not volume, is the source of its influence.
Export capacity is a separate question from production capacity. The United States is the largest producer and also a large importer, because its refineries are configured for heavier grades than most of its shale output. Volume rankings therefore say less about market power than trade flows do.
Demand: who consumes it and for what
Roughly half of world oil demand goes to road transport, with aviation, shipping, petrochemicals and heating taking most of the remainder. Demand growth in recent years has come entirely from non-OECD economies, led by China, and the IEA noted that in 2026 petrochemical feedstocks would represent more than half of expected gains, against only a third in 2025 when transport fuels dominated.
Those expectations did not survive the year. After the Hormuz disruption pushed prices above US$100 for much of the second quarter, the IEA moved from forecasting growth of 850 kb/d to forecasting a contraction of 1.1 mb/d for 2026, with the second quarter alone down about 5 mb/d year on year. Petrochemicals and aviation absorbed the sharpest cuts.
This is the demand-side mechanism worth internalising: high prices do not merely redistribute barrels, they destroy consumption, and the destruction concentrates in the most price-sensitive uses rather than spreading evenly.
Crude oil chokepoints
Around 80 mb/d of oil moves by sea, and the routes are few. The EIA's transit figures for the first half of 2025 give the ranking: the Strait of Malacca at 23.2 mb/d, the Strait of Hormuz at 20.9, the Cape of Good Hope at 9.1, the Suez Canal and SUMED pipeline at 4.9, the Danish Straits at 4.9, Bab el-Mandeb at 4.2, the Turkish Straits at 3.7 and the Panama Canal at 2.3.
Volume alone misranks their importance. What matters is the ratio of flow to available substitution. Malacca carries the most oil but has the Lombok and Sunda detours, which cost days rather than cargoes. Bab el-Mandeb can be bypassed around the Cape, which is why traffic there fell by half after 2023 without the oil disappearing. Hormuz has no bypass at scale: the East-West and Habshan-Fujairah pipelines cover a fraction of the flow, which is why its interruption in 2026 produced a supply loss no strategic reserve release could offset.
Pipelines are the other layer, and they concentrate risk rather than dispersing it. The CPC pipeline demonstrates the pattern: one line, one terminal, and a 56% production cut at a field 1,500 kilometres inland when the terminal stopped loading. The same logic governs Black Sea shipping and Russian seaborne crude exports, where sanctions added a legal chokepoint on top of the physical ones.
Price dynamics
Crude prices form around three benchmarks: Brent for waterborne Atlantic Basin and most international trade, WTI for US inland barrels, and Dubai or Oman for Middle Eastern grades sold into Asia. Individual cargoes price as differentials to these, reflecting density, sulphur content and freight.
The mechanism that sets the level is spare capacity. When the world holds several million barrels a day of it, supply losses translate into modest price moves; when it is thin, small disruptions move prices sharply. This is why the 2026 shock repriced not only prompt contracts but long-dated forwards: the market was not pricing a temporary outage, it was repricing the concentration of production in the Persian Gulf.
Inventories provide the second buffer. Global observed stocks stood above 8.2 billion barrels in March 2026, the highest since early 2021, of which about 1.25 billion were government-held emergency reserves. IEA members released an unprecedented 400 million barrels that month. It cushioned the shock without closing the gap, which is the practical limit of strategic reserves against a transit interruption rather than a production loss.
Historical disruptions
| Date | Event | Observed impact | Source |
|---|---|---|---|
| Aug 2026 | US, Iran and Oman negotiate an interim agreement to reopen Hormuz without tolls | Brent falls to around US$79 from second-quarter levels above US$100 | Trading Economics; Axios |
| Jun 2026 | US-Iran memorandum of understanding; Hormuz transits partially resume | Brent briefly falls below US$70; traffic remains a fraction of the pre-war 120 to 130 daily transits | J.P. Morgan; Al Jazeera (Kpler data) |
| Mar 2026 | Hormuz traffic effectively halted; IEA releases 400 mn bbl | Global supply falls 10.1 mb/d to 97 mb/d, the largest disruption on record; dated Brent passes US$140 | IEA; Trading Economics |
| Feb 28, 2026 | US and Israel begin military operations against Iran | Insurers withdraw war-risk cover for the Persian Gulf; Gulf loadings halt | Trading Economics; Al Jazeera |
| Dec 2022 | G7 price cap on Russian crude takes effect | Shadow fleet expansion; Russian exports redirect from Europe to Asia | European Commission |
| 2020 | Pandemic demand collapse and OPEC+ price war | WTI settles negative for the first time in history | Widely reported |
| 1973 to 1974 | OPEC oil embargo | Prices quadruple; strategic petroleum reserves created in response | IEA founding record |
Companies and assets along the chain
The chain divides into four links with distinct exposure. Upstream sits with national oil companies, which control most reserves, and with the international majors that operate the largest non-OPEC developments. Midstream sits with pipeline operators and tanker owners, and it is here that transit risk is priced most directly, through freight rates and war risk premiums that reset within days of an incident.
Refining is its own bottleneck, and one that price data obscures. Refineries are configured for specific crude qualities, so losing a grade is not the same as losing barrels. In April 2026, Middle Eastern and feedstock-constrained Asian refineries cut runs by about 6 mb/d, to 77.2 mb/d, and product markets tightened faster than crude markets.
Downstream and adjacent, exposure sits with marine insurers, with airlines and petrochemical producers whose input costs move with crude, and with oil-importing economies whose current accounts and inflation track the price directly.
This page describes exposure. It does not assess securities or recommend positions.
What to watch
The IEA Oil Market Report and the EIA Short-Term Energy Outlook, both monthly, are the reference series for supply, demand and inventories. OPEC+ spare capacity, published in the same reports, determines how violently the market reacts to any given disruption. Chokepoint transit counts from Kpler and Vortexa show physical flows before they appear in official statistics. War risk premiums for the Persian Gulf, Black Sea and Red Sea price transit risk continuously. Finally, refinery runs and product cracks reveal whether a crude disruption has become a fuel disruption, which is where the economic damage concentrates.
FAQ
How much oil does the world use per day? About 105.2 million barrels per day in 2025, the first year demand exceeded 105 mb/d. Roughly 80 million barrels a day of oil and petroleum products move by sea, meaning the majority of the world's oil crosses at least one maritime chokepoint before reaching a refinery.
Which country produces the most crude oil? The United States, at 13.58 million barrels per day in 2025, about 16% of world output. Russia followed at 9.87 mb/d and Saudi Arabia at 9.51 mb/d. Those three countries together produced 39% of global crude, and the top ten produced more than 72%.
What are the main crude oil chokepoints? By volume in the first half of 2025: the Strait of Malacca at 23.2 mb/d, the Strait of Hormuz at 20.9, the Cape of Good Hope at 9.1, the Suez Canal and SUMED pipeline at 4.9, the Danish Straits at 4.9, Bab el-Mandeb at 4.2, the Turkish Straits at 3.7 and the Panama Canal at 2.3. Hormuz is the most critical because it has the least substitution capacity.
What happens to oil prices when a chokepoint closes? It depends on available spare capacity and on whether alternatives exist. When Hormuz traffic halted in 2026, global supply fell 10.1 mb/d in a single month and dated Brent passed US$140. By contrast, Red Sea disruptions rerouted cargoes around the Cape of Good Hope at higher freight cost without a comparable price response, because the oil still reached buyers.
Can strategic petroleum reserves offset a supply disruption? Partially and temporarily. IEA members released an unprecedented 400 million barrels in March 2026 against a supply loss running above 10 mb/d, which cushioned the shock without closing the gap. Reserves substitute for lost production more effectively than for lost transit, since a blocked strait also blocks the delivery of released barrels to some buyers.
Why do high oil prices reduce demand? Because some consumption is discretionary or substitutable. After prices moved above US$100 in 2026, the IEA shifted from forecasting demand growth of 850 kb/d to a contraction of 1.1 mb/d, with the sharpest declines in petrochemicals and aviation rather than in road transport, which adjusts more slowly.
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