The Strait of Hormuz, a critical maritime chokepoint measuring just 21 nautical miles wide at its narrowest corridor, is legally governed by a complex web of international maritime law, yet practically controlled by raw military power. Geographically, the strait falls entirely within the territorial waters of two coastal nations: Iran to the north and Oman to the south. Under the United Nations Convention on the Law of the Sea (UNCLOS), such strategic waterways are designated as international straits, granting global merchant vessels the right of uninterrupted “transit passage.” However, this legal framework is highly fragile in practice. Because Iran has signed but never formally ratified UNCLOS, Tehran maintains that it is not bound by transit passage rules, arguing instead that foreign vessels only enjoy the more restrictive right of “innocent passage,” which allows Iran greater authority to police and halt shipping.
Beyond legal disputes, the actual physical control of the strait is heavily dominated by Iran’s Islamic Revolutionary Guard Corps (IRGC). Due to the northern shipping lanes hugging the Iranian coastline and its scattered military islands, Iran can easily deploy asymmetric tactics—including sea mining, fast-attack craft swarms, and shore-to-ship missiles—to disrupt the flow of 20 million barrels of oil per day. While Oman maintains sovereignty over the southern shipping lanes and prefers quiet diplomacy, it lacks the naval muscle to counter Iranian posturing. Consequently, the United States and its allies routinely deploy heavily armed carrier strike groups to enforce freedom of navigation. This creates a fragmented reality where international law declares the strait a free global highway, Oman quietly hosts its vital lanes, but Iran retains a de facto operational veto over who gets to pass.
