
Conversations Iran's position of power in the Strait of Hormuz
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Mar 20, 2026 Jennifer Parker, former Royal Australian Navy officer and maritime security expert now at ANU and the Lowy Institute. She explains why Iran can dominate the Strait of Hormuz. Short takes cover navigational choke points, IRGC small-boat and drone tactics, submarine strikes and the risks to global oil flows and regional escalation.
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Tense First Passage Through the Strait
- Jennifer Parker described sailing into the Strait of Hormuz in 2007 with HMAS Arunta amid high tension after the HMS Cornwall boarding team was seized by Iran earlier that year.
- She recounted daily harassment by IRGC small boats pointing weapons and yelling, creating rapid threat-assessment dilemmas for her ship's crew.
Geography Makes Hormuz Disproportionately Dangerous
- The Strait of Hormuz is 33 kilometres at its narrowest but navigationally constrained to only a few safe kilometres, concentrating traffic and risk.
- In 2007 about 100–130 ships transited daily, making military threats and navigation congestion mutually amplifying hazards.
Iran's Geographic Leverage Over Global Oil
- Iran's northern position and territorial waters slice into the strait, allowing Tehran to dominate and rapidly position forces to threaten transiting shipping.
- Parker notes this geography underpins Iran's ability to impose economic pressure by threatening 20% of global oil flow.
