A Corridor Nobody Fully Owns: The Oman-Iran Routing Plan and the Law of the Strait

The Oman-Iran framework arrives at a moment of acute stress on global energy logistics. Since fighting began earlier this year, maritime traffic through the Strait of Hormuz — a passage only 21 nautical miles wide at its narrowest point — has reportedly dropped by as much as 70%, disrupting flows that normally carry around 13 million barrels of oil a day alongside a substantial share of the world's seaborne LNG. The proposed fix is narrow by design: an organized routing scheme, inbound traffic near Iranian waters and outbound near Oman's, toll-free in its initial phase, intended to give shippers enough operational predictability to return. The exposure varies sharply across the region's biggest buyers. Japan is the most structurally vulnerable, with more than 90% of its crude oil dependent on Middle Eastern supply and no meaningful pipeline alternative — meaning a closed strait forces it toward drawdowns of strategic reserves it would strongly prefer to avoid. South Korea, at 70–80% reliance, feels the disruption most acutely through its petrochemical and manufacturing base, where condensate shortages translate directly into higher industrial costs. India's exposure is more mixed — over half its crude and the bulk of its Qatari LNG contracts move through Hormuz, but its expanded Russian crude imports via non-Gulf maritime routes give it a partial buffer, with fertilizer security (up to 30% of globally traded urea and ammonia transits the strait) as the more acute risk. China, despite being the largest single importer of Gulf crude, is best insulated, drawing on overland pipelines from Russia, Kazakhstan, and Myanmar plus sizable strategic reserves — and its steady diplomatic footing with both Tehran and Muscat means Chinese-flagged vessels are likely to face the least friction under any Iranian pre-approval regime. But the framework's legal footing is genuinely contested, not just politically inconvenient. Under UNCLOS, the strait qualifies as an international passage governed by the Transit Passage regime, which bars coastal states from suspending, restricting, or rerouting foreign shipping. Iran, however, signed but never ratified UNCLOS and asserts the stricter Innocent Passage standard, under which it retains discretion to restrict vessels it deems a security risk. Oman's ratification is real but qualified, including standing requirements for prior notice from foreign warships. A bilateral route map imposed without submission to the International Maritime Organization — the required body for any new Traffic Separation Scheme under UNCLOS Article 41 — sits outside the treaty's own procedural bar, regardless of how sound the safety logic behind it might be. The toll question compounds the ambiguity. UNCLOS Article 26 permits charges only for services actually rendered to a vessel — pilotage, towage, and the like — and explicitly bars levies for the fact of passage itself. The framework's toll-free interim period sidesteps this in the short term, but the stated intent to eventually monetize security, demining, or administrative oversight moves toward exactly the kind of transit levy Article 26 was written to prohibit. In practice, this leaves the corridor operating in a gray zone: functionally useful for easing a real shipping crisis, but legally exposed to challenge by any third-party flag state — including the United States — that chooses to treat it as an unlawful restriction on customary transit rights.