- Iran has fortified 19 islands in the 100-mile Strait of Hormuz with missile batteries, radar systems, airstrips, submarine pens, and fast-attack boat facilities — what Tehran calls unsinkable aircraft carriers
- The strait carried roughly 20% of the world’s traded crude oil before the war; traffic has slowed to a trickle since the U.S.-Israeli air campaign began Feb. 28, with nearly all transiting tankers now having an Iran connection
- Iran has erected a gatekeeping system requiring vessels to contact the IRGC for clearance — with some operators reportedly paying up to $2 million in Chinese yuan per transit for a very large crude carrier
- The USS Tripoli has arrived in the Middle East carrying the 31st Marine Expeditionary Unit, which specializes in amphibious island operations — signaling that a military push to reopen the strait may be imminent
What Happened?
Since the U.S.-Israeli air war on Iran began Feb. 28, Iran has tightened its grip on the Strait of Hormuz using a network of fortified islands. The five most strategically significant: Kharg — where Iran loads 90% of its crude oil, located hundreds of miles northwest of the strait — along with Qeshm, the largest island at the strait, which hosts naval stations and missiles buried in underground tunnels; Larak, described by analysts as “the corridor’s operational backbone” for monitoring vessel traffic; and the tiny Greater and Lesser Tunb islands, which sit directly between the strait’s two 2-mile-wide shipping channels. Ships transiting the strait have been diverted from their pre-war routes along the Omani coast and are now forced through a narrower channel between Larak and Qeshm, hugging the Iranian coastline. Iran has established what amounts to a tollbooth at sea: vessel operators must contact the IRGC through intermediaries and submit documentation for clearance, with some paying up to $2 million per transit.
Why It Matters?
The Strait of Hormuz is the world’s most critical oil chokepoint, and Iran’s island infrastructure gives it a physical, multi-layered lock on the waterway that cannot be dissolved simply through diplomacy or airstrikes on the mainland. The fortifications represent decades of deliberate investment — missiles in underground tunnels, satellite communications-jamming systems, fast-attack boats with antiship missiles — purpose-built to make denial of access cheap for Iran and prohibitively costly for anyone challenging it. The IRGC’s emerging transit-fee regime creates perverse incentives: Iran now has a direct financial interest in maintaining control rather than negotiating access. Oil prices above $100 a barrel are increasingly a reflection of this structural control, not just temporary conflict risk.
What’s Next?
Reopening Hormuz is widely described as the decisive next phase of the conflict — achievable either through a negotiated settlement or a military operation to neutralize or capture Iran’s island positions. President Trump has floated seizing Kharg as leverage, but military analysts note it is large, deep in Iranian territory, and may not compel Tehran to stand down. The more actionable targets are Larak and the Tunbs, which sit directly in the transit corridors. The arrival of the USS Tripoli with the 31st Marine Expeditionary Unit — trained specifically for amphibious island operations — signals that military planners are actively preparing for this contingency. Any resolution will rank among the most consequential geopolitical events of the decade.
Source: The Wall Street Journal
