Trump posts map labeling Strait of Hormuz as US territory while Iran rejects claim

Social media declaration and territorial claim

Donald Trump posted an annotated map of the Strait of Hormuz on Truth Social on 18 August 2026, labeling the maritime passageway as New US Territory. The post followed several days of statements in which Trump asserted that the United States exercises total control over the strategic waterway separating Iran and Oman. Trump stated on Truth Social that no diplomatic negotiations with Tehran are taking place or scheduled, asserting that the naval blockade of Iranian ports remains fully in effect while claiming that sea mines in the strait have been cleared or detonated.

I like the idea of declaring it as a territory. We can do that. We have total control over the strait.

Iranian rejection and diplomatic impasse

Iranian officials reacted to the claims, dismissing any assertion of American territorial ownership over the waterway. Iranian Deputy Foreign Minister Kazem Gharibabadi stated on X that the strait remains Iranian territory, describing Trump's post as an illusion. Gharibabadi added that the waterway cannot be captured through social media posts, aircraft carriers, executive orders, or campaign speeches.

The Strait of Hormuz was Iranian, is Iranian and will remain Iranian.

Tehran maintained that passage through the strait will remain restricted until the United States fulfills the terms of a framework agreement established in June. Iranian chief negotiator Mohammad Baqer Qalibaf stated that reopening the passage depends on Washington lifting the blockade on Iranian ports, removing oil sanctions, releasing frozen Iranian financial assets, and ending military operations. A 60-day negotiation window established under the June framework expired without an agreement between the parties.

Commercial shipping disruptions and traffic decline

The conflict, which began in late February 2026, has restricted commercial navigation through a chokepoint that handled roughly 20% of global oil and liquefied natural gas transport before hostilities commenced. Prior to the war, more than 130 vessels navigated the strait daily. Shipping data compiled by Kpler showed that only five cargo vessels transited the waterway over the weekend of 15–16 August 2026, down from 31 vessels during the preceding weekend. Preliminary maritime data recorded six commercial ships passing through on 17 August 2026, compared to a ten-day rolling average of eleven ships.

Legal constraints under maritime and international law

Legal specialists emphasized that presidential proclamations cannot establish sovereign title under domestic or international legal standards. Jason Chuah, a professor of maritime law at City, University of London, noted that United States constitutional procedures govern territorial acquisition, while international law and the United Nations Charter prohibit unilateral annexation. Chuah noted that military occupation provides physical control but does not confer legal ownership, adding that the strait constitutes sovereign waters subject to international navigation rights rather than alienable property. Simon Baughen, a professor of shipping law at Swansea University, observed that acquiring the waterway under international law would require Iran to formally cede its territorial waters, an outcome he evaluated as very unlikely. Baughen also noted that any trilateral toll arrangement between the United States, Iran, and Oman would conflict with customary maritime law and the 1982 United Nations Convention on the Law of the Sea.