What is the Strait of Hormuz and why do attacks there threaten global shipping?
The Strait of Hormuz is the Persian Gulf's only sea outlet, and blocking it can disrupt global energy shipping and prices.
Covers: The geography of the Strait of Hormuz, its role as a chokepoint for global oil and gas shipments, the types of attacks and seizures that have occurred there, and how disruptions affect shipping, insurance and energy prices. Does not cover the full history of regional conflicts or military strategy beyond their shipping impact.
Also answers: Why is the Strait of Hormuz important for global shipping? · How do attacks in the Strait of Hormuz affect oil prices? · What percentage of world oil passes through the Strait of Hormuz? · Strait of Hormuz conflict and global trade explained
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The short answer
Evidence-backed AI-prepared starting mapThe Strait of Hormuz is the only sea passage between the Persian Gulf and the open ocean, running about 167 km (104 miles) between Iran to the north and the Musandam Peninsula of Oman and the UAE to the south, narrowing to roughly 39 km (24 miles) at its tightest. It is one of the world's most important maritime chokepoints: during 2023–2025, about 25% of…12
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At a glance
The picture in numbers
Live · updated just now
- seaborne oil trade25%
- world liquefied natural gas20%
20,000 mariners
- delays, rerouting, insurance and trade disruption10.7 USD billion
- increased freight costs3.4 USD billion
delays, rerouting, insurance and trade disruption is about 3.1 times increased freight costs.
The evidence behind it
4 sources- Other studies and data2
- Background2
Published in 2025 and 2026
| Source | Kind | Year |
|---|---|---|
| Systemic impacts of disruptions at maritime chokepoints. | Other studies and data | 2025 |
| Medicine's commodity dependencies and the Strait of Hormuz. | Other studies and data | 2026 |
| Strait of Hormuz (Wikipedia) | Background | Unknown |
| 2026 Strait of Hormuz crisis (Wikipedia) | Background | Unknown |
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Hormuz is the Persian Gulf's only sea outlet, roughly 167 km long and as narrow as 39 km, bordered by Iran to the north and Oman and the UAE to the south.1
Evidence-backedIn 2023–2025 it carried about 25% of seaborne oil trade and 20% of world LNG, and it is the only maritime route for the UAE, Qatar, Bahrain, Kuwait and Iraq.1
Evidence-backedSince 28 February 2026 Iran has largely blocked the strait — warning ships off, boarding and attacking merchant vessels, and laying mines — and tanker traffic fell near zero.2
Evidence-backedChokepoint disruption costs come through delays, rerouting, insurance premiums, trade disruption and higher freight costs, and can hit countries far from the chokepoint.3
Evidence-backedThe 2026 closure pushed oil prices sharply up and, per one commentary, exposed medicine's dependence on petrochemicals, helium and globalized manufacturing.4
Evidence-backed
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What it means for you
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If you are tracking energy prices or fuel costs
expect upward pressure while the strait is disrupted, since about a quarter of seaborne oil and a fifth of LNG normally transit it and tanker traffic fell near zero after 28 February 2026.12
Evidence-backedIf you ship goods through the Persian Gulf
plan for delays, rerouting and higher insurance and freight costs, the channels through which chokepoint disruption produces economic losses.3
Evidence-backedIf you work in a Gulf state that depends on the strait as its only maritime route
treat supply shortages as a live risk, because the UAE, Qatar, Bahrain, Kuwait and Iraq have no alternative sea passage.1
Evidence-backedIf you are a hospital administrator, practice leader or clinician
consider establishing supply-continuity frameworks now, rather than improvised rationing and reactive procurement later, given medicine's dependence on petrochemicals, helium and globalized manufacturing.4
Evidence-backedIf you are a mariner or crew member in the Persian Gulf
be aware that about 20,000 mariners and 2,000 ships were reported stranded in the Gulf as of 21 April 2026.2
Evidence-backedIf you are assessing exposure to chokepoint risk more broadly
note that countries far from a chokepoint, including in Western Africa and Central Asia, can be among those most affected.3
Evidence-backedThe full explanation
Evidence-backed AI-prepared starting mapThe Strait of Hormuz is the only sea passage between the Persian Gulf and the open ocean, running about 167 km (104 miles) between Iran to the north and the Musandam Peninsula of Oman and the UAE to the south, narrowing to roughly 39 km (24 miles) at its tightest. It is one of the world's most important maritime chokepoints: during 2023–2025, about 25% of seaborne oil trade and 20% of the world's liquefied natural gas passed through it annually, and it is the only maritime route for several Gulf countries, including the UAE, Qatar, Bahrain, Kuwait and Iraq. Because so much energy trade funnels through one narrow waterway, attacks, seizures or a closure there can quickly disrupt global shipping, raise freight and insurance costs, and push energy prices up.12
- Evidence 19
- Interpretation 1
The full story · 3 chapters
01
What and where the strait is, and why it matters
AI summary:The strait is the Persian Gulf's only sea passage, bordered by Iran and Oman and the UAE, and carries a large share of world oil and gas.
Evidence-backed: The Strait of Hormuz is a waterway between the Persian Gulf and the Gulf of Oman. Iran lies on the north coast; the south coast is the Musandam Peninsula, under Oman's Musandam Governorate, with part of the peninsula's southwest under the United Arab Emirates. It is about 104 miles (90 nautical miles; 167 km) long, varying in width from roughly 60 miles (52 nautical miles; 97 km) to 24 miles (21 nautical miles; 39 km). It provides the only sea passage from the Persian Gulf to the open ocean and is one of the world's most strategically important chokepoints.1
Evidence-backed: Its importance is volume plus lack of alternatives. During 2023–2025, 20% of the world's liquefied natural gas and 25% of seaborne oil trade passed through the strait annually. It is a major route for petroleum products to Europe and Asia and is described as critical for Europe's energy supply. It is also the only maritime route for several Gulf countries, including the UAE, Qatar, Bahrain, Kuwait and Iraq, so disruption can cause severe supply shortages.1
Evidence-backed: Before the 2026 Iran War, the strait had not been closed for any extended period during Middle East conflicts, although Iran occasionally threatened to close it.1
02
Attacks, seizures and the 2026 closure
AI summary:Iran has largely blocked the strait since 28 February 2026, attacking ships and laying mines, and tanker traffic fell near zero.
Evidence-backed: Shipping traffic through the strait has been largely blocked by Iran since 28 February 2026, when the United States and Israel launched an air war against Iran. In retaliation, the Iranian Revolutionary Guard Corps (IRGC) issued warnings forbidding passage through the strait, boarded and attacked merchant ships, and laid sea mines in the strait. From 13 April to 29 May 2026, the US simultaneously blockaded Iranian ports.2
Evidence-backed: Until the war's start, about 25% of the world's seaborne oil trade and 20% of the world's liquefied natural gas passed through the strait. Soon after the conflict began, the number of tankers transiting the strait dropped near zero. On 27 March, the IRGC announced the strait was closed to any vessel going "to and from" the ports of the US, Israel and their allies. The International Maritime Organization reported on 21 April that about 20,000 mariners and 2,000 ships were stranded in the Persian Gulf because of the closure.2
Evidence-backed: The 2026 closure disrupted approximately one-fifth of global petroleum transit and sent oil prices sharply upward, according to a medical-journal commentary. That commentary frames the episode as exposing medicine's structural dependence on petrochemicals, helium and globalized manufacturing, and argues that prior crises — the 1973 oil embargo and the 2021 Suez blockage — revealed vulnerabilities that just-in-time supply chains have deepened.4
03
Why disruption there threatens global shipping and prices
AI summary:Because one narrow passage carries so much trade, disruption there causes delays, rerouting, higher insurance and freight costs, and energy price rises.
Evidence-backed: Chokepoints concentrate risk: a single narrow passage carries a large share of world trade, so a hazard there can disrupt many countries at once. Research quantifying maritime chokepoint disruptions estimates the expected value of trade disrupted at chokepoints at USD192 billion annually, mainly attributed to geopolitical risk at the Taiwan Strait and Suez Canal and a combination of hazards affecting the Bab el-Mandeb Strait. Economic losses from chokepoint disruptions — through delays, rerouting, insurance premiums and trade disruption — are estimated at USD10.7 billion per year, plus an additional USD3.4 billion per year from increased freight costs. Countries most affected are those near the Suez Canal and Bab el-Mandeb, but also further away, including in Western Africa and Central Asia.3
Interpretation: Applied to Hormuz, the mechanism is straightforward: with roughly a quarter of seaborne oil and a fifth of LNG normally passing through, a closure forces delays and rerouting, raises insurance premiums and freight costs, and tightens energy supply — which is what the 2026 episode is described as doing, with oil prices rising sharply and tanker traffic falling near zero. The same commentary warns that sustained disruption can cascade beyond energy into medicines and medical devices, because those supply chains depend on petrochemicals, helium and globally distributed manufacturing.243
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What to remember
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Hormuz is the Persian Gulf's only sea outlet, roughly km long and as narrow as 39 km, bordered by Iran to the north and Oman and the UAE to the south.
In it carried about 25% of seaborne oil trade and 20% of world LNG, and it is the only maritime route for the UAE, Qatar, Bahrain, Kuwait and Iraq.
Since February 2026 Iran has largely blocked the strait — warning ships off, boarding and attacking merchant vessels, and laying mines — and tanker traffic fell near zero.
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- 1Strait of Hormuz (Wikipedia)WikipediaPublished Oct 14, 2026Checked Oct 14, 2026
“The Strait of Hormuz () is a waterway between the Persian Gulf and the Gulf of Oman. On the north coast lies Iran, and on the south coast lies the Musandam Peninsula under the Musandam Governorate of Oman, with a portion of the southwest of the peninsula under the United Arab Emirates (UAE). The strait is about 104 miles (90 nmi; 167 km) long, with a width varying from about 60 mi (52 nmi; 97 km) to 24 mi (21 nmi; 39 km). It provides the only sea passage from the Persian Gulf to the open ocean and is one of the world's most strategically important choke points. During 2023–2025, 20% of the world's liquefied natural gas and 25% of seaborne oil trade passed through the strait annually. It is a major route of petroleum products for Europe and Asia and is critical for Europe's energy supply. It is also the only maritime route for several Gulf countries including the UAE, Qatar, Bahrain, Kuwait, and Iraq, and disruption to the strait can cause severe supply shortages. Before the 2026 Iran War, the strait had not been closed for any extended time during Middle East conflicts, although Iran occasionally threatened to close the strait.”
- 22026 Strait of Hormuz crisis (Wikipedia)WikipediaPublished Oct 14, 2026Checked Oct 14, 2026
“Shipping traffic through the Strait of Hormuz, a major maritime choke point for world energy trade, has been largely blocked by Iran since 28 February 2026, when the United States and Israel launched an air war against Iran. In retaliation, the Iranian Revolutionary Guard Corps (IRGC) issued warnings forbidding passage through the strait, boarded and attacked merchant ships, and laid sea mines in the strait. From 13 April to 29 May 2026, the US simultaneously blockaded Iranian ports. Until the war's start, about 25% of the world's seaborne oil trade and 20% of the world's liquefied natural gas (LNG) passed through the strait. Soon after the start of the conflict, the number of tankers trafficking the strait dropped near zero. On 27 March, the IRGC announced that the strait was closed to any vessel going "to and from" the ports of the US, Israel, and their allies. The International Maritime Organization reported on 21 April that about 20,000 mariners and 2,000 ships were stranded in the Persian Gulf due to the closure.”
- 3Systemic impacts of disruptions at maritime chokepoints.Nature communications (Verschuur et al.)Published Nov 24, 2025Checked Oct 14, 2026
“Yet, the exposure of countries to these disruptions has not been comprehensively assessed, inhibiting adequate preparedness. Here, we quantify the systemic impacts of maritime chokepoint disruptions subject to a variety of hazards, both natural and human-induced. The expected value of trade disrupted at chokepoints is estimated to be USD192 billion annually, mainly attributed to geopolitical risk at the Taiwan Strait and Suez Canal, and a combination of hazards affecting the Bab el-Mandeb Strait. We estimate the economic losses of chokepoint disruptions, due to delays, rerouting, insurance premiums and trade disruptions, to be USD10.7 billion per year, and an additional USD3.4 billion per year due to increased freight costs. In both cases, risks to the Suez Canal and Bab el-Mandeb Strait drive these losses. Countries most affected are in the vicinity of these two chokepoints, but also further away, including countries in Western Africa and Central Asia. At a time of heightened geopolitical tensions and climate change, our results help to quantify the implications of these risks and can present a useful starting point to identify resilience interventions to mitigate these threats.”
- 4Medicine's commodity dependencies and the Strait of Hormuz.Clinics in dermatology (Smith et al.)Published Jul 28, 2026Checked Oct 14, 2026
“The 2026 closure of the Strait of Hormuz has disrupted approximately one-fifth of global petroleum transit, sending oil prices sharply upward and exposing medicine's structural dependence on petrochemicals, helium, and globalized manufacturing. This contribution examines how medicine's reliance on globalized commodities exposes patients to medication and device shortages during sustained supply disruption. Prior crises, including the 1973 oil embargo and the 2021 Suez blockage, revealed vulnerabilities that current just-in-time supply chains have deepened. We urge practice leaders, hospital administrators, and clinicians to establish supply continuity frameworks now, before scarcity forces improvised rationing and reactive procurement.”
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What is the specific annual economic loss attributable to Hormuz disruption, as distinct from the Suez, Bab el-Mandeb and Taiwan Strait figures?
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How have war-risk insurance premiums and freight rates for Gulf routes changed since February 2026?
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How long did the closure last, and how quickly did tanker traffic and oil prices recover?
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Which pipelines or overland routes can bypass the strait, and how much of the normal volume can they carry?
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