The Strait of Hormuz is often imagined as a place that can be “closed” by a single order, as though it were a gate. In reality, Iran does not block it with a physical barrier or by imposing a total, uninterrupted blockade across the entire waterway. Rather, it creates a military, insurance, and political environment in which the passage of ships becomes either too dangerous or selectively permitted only on Iranian terms.
The reason this instrument works at all lies in geography. The Strait of Hormuz links the Persian Gulf with the Gulf of Oman and the Arabian Sea, separating Iran from Oman. It is one of the world’s most important energy chokepoints. Tankers move through a narrow, predictable corridor, and in its tightest section the traffic lanes are extremely limited. That makes shipping movements highly exposed and relatively easy to monitor, threaten, delay, or disrupt.
For precisely that reason, Iran does not need to seal the Strait completely. It is enough to destroy the sense of safe transit. When tankers move slowly, along fixed routes, and through a confined passage, even a limited number of attacks, threats, or suspicions of mining can sharply alter the behaviour of insurers, shipowners, charterers, and captains. In such circumstances, the commercial route remains technically open, yet functionally unstable.
.jpg)