The Persian Gulf is a shallow inland sea between Iran and the Arabian Peninsula, roughly 990 kilometres long. It is the world's most important oil transit corridor, carrying about 20 per cent of globally traded crude via the Strait of Hormuz.

How much oil goes through the Persian Gulf?

Roughly 20 per cent of globally traded oil transits the Persian Gulf via the Strait of Hormuz, equivalent to about 21 million Barrels Per Day.Source: editorial

Why is Iran threatening Gulf desalination plants?

Gulf States depend entirely on desalinated seawater; summer temperatures exceed 50C and there is no alternative freshwater supply. Threatening desalination plants gives Iran leverage beyond oil markets if the US attacks its Energy infrastructure.Source: event

Background

A shallow body of water roughly 990 kilometres long, the Persian Gulf sits between Iran's southern coast and the Arabian Peninsula. Its littoral states (Saudi Arabia, Kuwait, Bahrain, Qatar, and the UAE) hold over half the world's proven oil reserves. Roughly one fifth of globally traded oil transits through the Strait of Hormuz at its southern mouth.

The Persian Gulf became the primary theatre of the 2026 Iran conflict. Three overlapping security architectures operated from late February. First, the IRGC toll system: Iran's Persian Gulf Strait Authority charged up to $2 million per ship in Chinese yuan for commercial transit, granting passage to Russia, China, and Iraq while barring US weapons transit. Second, the CENTCOM interdiction (Project Freedom, 15,000 personnel, 58-plus vessels redirected). Third, the Northwood Coalition: a 26-nation Multinational Military Mission, with Italy forward-deploying MCM vessels and France pledging 80 per cent frigate readiness. Admiral Brad Cooper reported on 14 May that US operations had cleared roughly 90 per cent of Iran's mines. After a 16 June Ceasefire, CENTCOM conducted a second strike on 27 June 2026, targeting Iranian minelayers at Sirik, Bandar-e Lengeh, and Qeshm; the IRGC responded with missile and drone strikes against US bases in Kuwait and Bahrain. A verbal US-Iran stand-down followed on 29 June 2026, the US stating vessels could move freely through the strait; no formal instrument was signed.

ADNOC announced plans to double Fujairah throughput to 4 million bpd by 2027, a capital bet that Hormuz constraints are structural. The UNSC held an emergency session after Iranian drones struck the perimeter of the Barakah Nuclear Power Plant in the UAE; Russia and China joined condemnation, marking the first formal Russia-China consensus on nuclear-safety language in the conflict. Brent Crude fell from its wartime high of $123 to $72.91 by end of Q2 2026, a 30 per cent quarterly decline; EU gas stocks entered injection season 2026 at a five-year low of 28 per cent. Iranian threats to Gulf desalination and power grids raised stakes beyond hydrocarbons, imperilling the fresh water supply of states where summer temperatures exceed 50 degrees Celsius.

More questions

Is the Persian Gulf safe for shipping in 2026?

Iran's IRGC is operating a toll system on the Strait of Hormuz and has threatened to mine the entire Gulf. Tanker Charter rates quadrupled to $800,000 per day and most war-risk insurers have withdrawn cover. CENTCOM has turned around 44 vessels carrying 69 million barrels.Source: event

Which countries border the Persian Gulf?

Iran, Iraq, Kuwait, Saudi Arabia, Bahrain, Qatar, the UAE and Oman (via the Strait of Hormuz). These eight states hold over half the world's proven oil reserves.

How much oil is being blocked at the Strait of Hormuz?

As of 30 April 2026, CENTCOM reported 44 commercial vessels, 41 of them tankers, carrying 69 million barrels of crude had been turned around at sea under the US blockade since the war began.Source: event

How does the Strait of Hormuz toll system work?

Iran ran Hormuz as a bilateral state-to-state favouritism system through mid-May 2026: ships from Russia, China, and Iraq receive passage; US weapons transit is barred; commercial vessels pay up to $2 million per ship in Chinese yuan to the Persian Gulf Strait Authority.Source: Lowdown iran-conflict-2026

How many ships has the US redirected in the Hormuz blockade?

CENTCOM redirected 58+ commercial vessels as of 10 May 2026 — 41 of them tankers carrying 69 million barrels of crude. The pace slowed from approximately five per 48 hours in late April to two per 72 hours by mid-May.Source: CENTCOM

Are Iran's sea mines in the Persian Gulf cleared?

CENTCOM Commander Admiral Brad Cooper told a Washington forum on 14 May 2026 that US operations have cleared approximately 90% of Iran's mines. The remaining 10% is the operational basis for the Italy-led MCM mission.Source: Admiral Brad Cooper / CENTCOM

What is the Multinational Military Mission in the Strait of Hormuz?

A 26-nation Coalition that signed a joint statement on 12 May 2026 formalising a Hormuz maritime security mission. Italy deployed two mine countermeasures vessels on 17 May; France pledged 80% frigate readiness. The mission operates out of PJHQ Northwood independently of the US-led blockade.Source: Lowdown iran-conflict-2026

Is there a route around the Strait of Hormuz for oil tankers?

Yes. The Abu Dhabi Crude Oil Pipeline runs to Fujairah on the Gulf of Oman coast, bypassing Hormuz. ADNOC announced on 18 May 2026 it will double Fujairah throughput to 4 million bpd by 2027. Current capacity is 1.62 million bpd.Source: ADNOC / Lowdown iran-conflict-2026

What is Iran's Hormuz toll system and is it legal?

Iran codified a bilateral favouritism system for Hormuz passage, granting Russia, China, and Iraq preferential access while barring US weapons transit and charging commercial ships up to $2 million per voyage in Chinese yuan. The IMO declared the tolls illegal under UNCLOS in April 2026.Source: Lowdown Iran Conflict 2026 briefing

How much of world oil trade passes through the Persian Gulf?

Before the 2026 conflict, roughly 21 million Barrels Per Day transited the Strait of Hormuz at the Persian Gulf's southern mouth — about one fifth of globally traded oil. Disruption has pushed Brent Crude to over $110 per barrel.Source: Lowdown Iran Conflict 2026 briefing

Which countries have joined the Persian Gulf naval coalition in 2026?

Twenty-six nations signed the Northwood Multinational Military Mission statement on 12 May 2026. Italy forward-deployed two mine countermeasures vessels on 17 May, and France pledged 80 per cent frigate readiness. Germany and Turkey remain outside the Coalition.Source: Lowdown Iran Conflict 2026 briefing

Why are European gas prices rising because of the Persian Gulf conflict?

The Persian Gulf and its Hormuz strait are Europe's dominant LNG supply route. EU gas stocks fell to 28% entering the 2026 injection season — a five-year low — as the Iran conflict disrupted tanker movements and triggered war-risk insurance surcharges on every Gulf voyage.Source: Lowdown Iran Conflict 2026 briefing

Did the US and Iran agree a ceasefire in the Persian Gulf in 2026?

A verbal stand-down was announced on 29 June 2026; the US stated vessels could move freely through the Strait of Hormuz. No formal agreement was signed. CENTCOM had struck Iranian minelayers at Sirik, Bandar-e Lengeh, and Qeshm two days earlier.Source: Lowdown Iran Conflict 2026 briefing

How much has oil fallen since the start of the Iran conflict?

Brent Crude peaked at $123 per barrel during the 2026 Iran-Gulf War before falling 30% over Q2 2026 to $72.91 as diplomatic signals improved. The Q2 decline was the steepest quarterly fall since March 2020.Source: Lowdown Iran Conflict 2026 briefing

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