The Strait of Hormuz is suddenly the most important 33 kilometres of water on the planet. After US President Donald Trump rejected Iran’s proposal to reopen the waterway on September 26, Brent crude surged back toward $107 a barrel — and Indians started asking why a distant channel between Iran and Oman decides what they pay for petrol. This explainer breaks down where the strait is, why it matters, who controls it, and how a disruption there reaches an Indian fuel pump.
Table of Contents
Strait of Hormuz: where it is and why it is so narrow
The Strait of Hormuz is the narrow sea passage connecting the Persian Gulf — home to the oil terminals of Saudi Arabia, Iraq, Kuwait, the UAE and Qatar — to the Gulf of Oman and the open Arabian Sea beyond. At its narrowest point, between Iran to the north and Oman to the south, the strait is only about 33 kilometres wide, and the deep-water shipping lanes in each direction are narrower still, barely a few kilometres across in places.
That geography is the whole story. Every tanker leaving the Persian Gulf must pass through this single corridor; there is no alternative sea route. Pipelines that bypass it — such as Saudi Arabia’s East-West pipeline to the Red Sea — exist, but their capacity covers only a fraction of the volumes that normally sail through the strait. For practical purposes, Hormuz is a chokepoint with no substitute.
Why the Strait of Hormuz matters: a fifth of the world’s oil
Roughly one-fifth to one-quarter of the world’s oil supplies normally move through the Strait of Hormuz — around 20 million barrels a day of crude and petroleum products, plus a large share of the globe’s liquefied natural gas, including most of Qatar’s LNG exports. When traffic through the strait is restricted, as it has been during the months-long US-Iran confrontation, the world loses a huge slice of its available supply at once.
Oil markets react to the risk, not just the reality. Even the threat of closure forces traders to price in the cost of rerouting, higher insurance premiums for tankers, and the chance that spare production elsewhere cannot fill the gap quickly. That is why crude jumped more than 2 per cent in a single session after Trump’s rejection of the Hormuz proposal, and why Brent is up roughly 75 per cent this year as the confrontation has dragged into its eighth month.
Who controls the strait — and can Iran legally close it?
Control is shared and contested. Iran’s coastline runs along the entire northern side of the Strait of Hormuz, while Oman and the United Arab Emirates hold the southern shore. Under the UN Convention on the Law of the Sea, the strait is an international strait, which means ships of all nations enjoy the right of “transit passage” — they cannot legally be blocked even though the waters include territorial seas.
In practice, Iran has repeatedly threatened to close or mine the strait during confrontations, and its Islamic Revolutionary Guard Corps navy operates speedboats, mines and coastal missiles that could harass shipping. A full legal closure would violate international law, but markets do not wait for lawyers: the mere capability to disrupt traffic is enough to move the crude oil price, as the events of late September demonstrated.
The 2026 crisis: why Hormuz is in the news right now
The current standoff began months ago with the US-Iran confrontation in West Asia, during which Washington imposed a naval blockade on Iranian ports and Tehran restricted traffic through the strait in response. A fragile ceasefire built around a mid-June memorandum of understanding collapsed, and shipping through the waterway has been disrupted ever since.
The latest diplomatic round played out at the United Nations General Assembly in New York, where US envoys Steve Witkoff and Jared Kushner held indirect talks with Iranian Foreign Minister Abbas Araghchi, with Qatar shuttling messages between them. Iran offered to reopen the Strait of Hormuz within seven days and return to nuclear negotiations if Washington ended its naval blockade, lifted sanctions on Iranian oil sales and observed a regional ceasefire including Lebanon. Trump rejected the package on September 26, saying Tehran had “overplayed its hand,” though he added that he expected talks to resume through Qatari mediators this week.
“We don’t think this changes things much.”
Suvro Sarkar, Head of Energy Research, DBS Bank, on the market impact of the rejected Hormuz proposal (via Bloomberg)
Energy analysts are divided on how much further prices can run. DBS’s Sarkar noted that the market had never really expected the strait to reopen within seven days, which muted the shock. But with Brent already near $107 and winter demand approaching in the northern hemisphere, any fresh disruption — a tanker incident, a failed talks round, or an attack on Gulf energy infrastructure — would hit an already tight market.
How a Hormuz disruption reaches an Indian fuel pump
The chain from the Strait of Hormuz to an Indian petrol station has four links. First, India imports close to 90 per cent of the crude oil it consumes, much of it from Gulf producers whose tankers sail through Hormuz — so a supply squeeze raises the price of the exact barrels India buys. Second, costlier crude widens India’s import bill and weakens the rupee, which has already fallen about 6 per cent against the dollar this year; a weaker rupee makes every dollar-priced barrel more expensive in rupee terms.
Third, oil marketing companies revise retail fuel prices based on international benchmarks and exchange rates, so sustained high crude eventually shows up at the pump — directly for petrol and diesel, and indirectly through transport costs embedded in food prices. Fourth, the Reserve Bank of India watches all of this when setting interest rates: imported inflation is a key reason economists expect the RBI to raise the repo rate to 5.50 per cent at its October 5-7 meeting. Read our business coverage for the full policy preview and world news for continuing updates on the crisis.
Has the strait ever actually been closed?
Despite decades of threats, the Strait of Hormuz has never been fully sealed shut in the modern era. During the Iran-Iraq war in the 1980s — the so-called Tanker War — both sides attacked commercial shipping in the Gulf, yet oil kept flowing. Iran has threatened closure repeatedly since, including during the sanctions standoffs of 2011-12 and 2019, but each time the waterway stayed open.
History is only partial comfort. Past crises did not feature the combination seen in 2026: an active naval blockade, a collapsed ceasefire framework, Brent crude already up 75 per cent on the year, and a US-Iran confrontation in its eighth month. The strait’s record of staying open is reassuring — but it is the reason the waterway commands such a large risk premium in the crude oil price today, rather than a guarantee of calm tomorrow.
Frequently Asked Questions
Where is the Strait of Hormuz located?
The Strait of Hormuz lies between Iran to the north and Oman and the United Arab Emirates to the south, connecting the Persian Gulf to the Gulf of Oman and the Arabian Sea. At its narrowest it is only about 33 kilometres wide, making it one of the world’s most strategically sensitive maritime chokepoints.
How much of the world’s oil passes through the Strait of Hormuz?
Roughly one-fifth to one-quarter of global oil supplies — around 20 million barrels per day of crude and petroleum products — normally transit the Strait of Hormuz, along with a major share of the world’s liquefied natural gas. There is no alternative sea route out of the Persian Gulf, which is why any disruption moves global prices so sharply.
Can Iran legally close the Strait of Hormuz?
Under the UN Convention on the Law of the Sea, Hormuz is an international strait where all ships enjoy the right of transit passage, so a legal closure is not permitted. In practice, however, Iran’s naval forces could harass or mine shipping, and oil markets price in that physical capability regardless of the legal position.
Will the Hormuz crisis affect petrol prices in India?
India imports nearly 90 per cent of its crude, much of it via Hormuz, so sustained high oil prices plus a weaker rupee create upward pressure on pump prices. Retail revisions depend on oil marketing companies and tax policy, but prolonged Brent prices above $100 historically feed into Indian fuel and transport costs within weeks.
What is the latest news on the Strait of Hormuz in October 2026?
As of early October 2026, the strait remains restricted after the US rejected Iran’s September 26 proposal to reopen it within seven days. Qatari-mediated contacts between Washington and Tehran are expected to continue, Brent crude is holding near $107 a barrel, and markets are watching for any breakthrough — or escalation — in the coming days.
Read our full report on how the Hormuz crisis pushed crude toward $107, and see the market analysis behind the price surge.
