Kharg Island and the Temptation of Amphibious War

Friday 13 March 2026

In moments of acute geopolitical tension the map exerts an irresistible pull on the military imagination. Small places begin to loom large. Narrow waterways become decisive. Islands acquire an importance out of proportion to their physical scale. One such place is Kharg Island, a rocky outcrop lying some twenty-five kilometres off the Iranian coast in the northern Persian Gulf. For decades it has been the principal terminal through which Iran exports the majority of her crude oil. Tankers gather offshore, pipelines run from the mainland to vast storage tanks, and loading jetties project into the warm waters of the Gulf. To strike Kharg Island is therefore not merely to strike an island. It is to strike the economic heart of the Iranian state.

In the present climate of escalating confrontation between Iran and the United States and her allies, the possibility occasionally surfaces in strategic discussions that Washington might attempt to seize Kharg Island outright. Rather than relying solely upon air strikes or maritime interdiction, the United States could attempt an amphibious assault designed to occupy the island, deny Iran access to her principal export facility and thereby place enormous economic pressure upon Tehran.

Such a proposal sounds dramatic, and perhaps even audacious. Yet it also raises difficult questions. Could the island realistically be taken without excessive casualties? Would the strategic advantages justify the risks? And what might such a move mean for the wider war in the Middle East?

To answer these questions it is necessary first to understand the physical and military characteristics of Kharg Island itself.

Kharg is not large. It stretches roughly eight kilometres from north to south and perhaps four kilometres at its widest point. The terrain is generally flat limestone with limited natural cover, although petroleum installations, storage tanks and industrial structures provide a complex man-made landscape. For decades Iran has treated the island as a strategic fortress. During the Iran–Iraq war of the 1980s it endured repeated Iraqi air attacks precisely because of her importance as an oil export hub.

The island today is believed to host layered defences. These probably include coastal missile batteries, anti-ship missiles, radar installations, short-range air defence systems and a garrison of Islamic Revolutionary Guard Corps personnel. Iran has also invested heavily in anti-access and area denial capabilities throughout the Persian Gulf. Fast attack craft, naval mines and shore-based missile systems all form part of a defensive network designed to make amphibious operations extremely hazardous.

Any American plan to seize Kharg Island would therefore have to begin with overwhelming suppression of Iranian defences. This would likely involve a complex campaign combining cyber operations, electronic warfare, cruise missile strikes, air attacks and naval gunfire. The objective would be to blind Iranian radar, destroy missile launchers and neutralise command structures before any landing craft approached the shore.

The United States Navy and Marine Corps possess considerable experience in amphibious warfare. Modern expeditionary strike groups include amphibious assault ships capable of deploying helicopters, tilt-rotor aircraft and landing craft simultaneously. In theory a rapid vertical assault by helicopter-borne Marines could seize key points on the island while surface forces secure the shoreline.

Yet theory and practice in amphibious warfare are often very different things. Even small islands can prove extremely costly to capture when the defender is prepared and determined. The twentieth century is full of examples in which apparently minor geographical features required enormous sacrifices to seize. One need only recall Tarawa in 1943 or Iwo Jima in 1945 to appreciate the brutal arithmetic of attacking fortified islands.

Kharg Island differs from those Pacific battlegrounds in important respects. It lies close to the Iranian mainland, meaning that reinforcements, missile fire and drone attacks could arrive quickly from coastal bases. Iranian ballistic missiles and long-range rockets could also target American ships operating in the Gulf. The waters surrounding the island are relatively shallow and constrained, which would complicate naval manoeuvres and increase vulnerability to mines or small-boat attacks.

Another factor complicating any invasion would be the dense industrial infrastructure on the island. Oil storage tanks, pipelines and loading facilities are not merely economic assets. In combat conditions they become potential hazards. Fires, explosions and toxic smoke could turn sections of the island into dangerous terrain for both attacker and defender.

For these reasons American planners would likely seek to avoid a prolonged ground battle. The operational concept, if it existed, would almost certainly emphasise speed and shock. The island would need to be seized before Iranian forces on the mainland could organise a coherent response. Helicopter assaults, special operations raids and precision strikes might all be employed to overwhelm the garrison in the opening hours.

Whether such speed could realistically be achieved is uncertain. Iran has spent decades preparing for precisely this kind of confrontation in the Gulf. Even if the island were captured quickly the United States would then face the problem of holding it. A small garrison on a narrow island would remain vulnerable to missile bombardment, drone strikes and sabotage operations launched from the mainland.

Nevertheless the strategic attraction of Kharg Island is obvious. Iran depends heavily upon oil exports for state revenue. Although sanctions have reduced official export levels, significant volumes of crude still leave the country through complex networks of shipping intermediaries. Kharg Island remains central to that system.

If the United States controlled Kharg, Iran’s ability to export oil through the Gulf would be dramatically curtailed. Pipelines leading to the island could be severed or monitored. Tanker loading could be halted entirely. The financial pressure on Tehran would intensify rapidly, particularly if combined with maritime enforcement operations across the Gulf.

Beyond economics, there would also be a psychological effect. Occupation of Iranian territory by American forces would represent a profound humiliation for the Iranian leadership. It would demonstrate that Washington could project power directly onto the Iranian coastline despite decades of Iranian investment in defensive capabilities.

Yet psychological shocks can cut both ways. The seizure of Kharg Island could also galvanise Iranian nationalism. The Islamic Republic has often used external threats to consolidate internal unity. A visible American occupation might provoke a surge of domestic mobilisation rather than political capitulation.

There is also the broader strategic environment to consider. The Persian Gulf is one of the world’s most sensitive energy arteries. A major amphibious assault in the region would almost certainly provoke further retaliatory measures by Iran against shipping in the Strait of Hormuz. Mines, missile attacks and drone strikes could disrupt global oil markets overnight. Insurance rates for tankers might skyrocket, and commercial shipping could become hesitant to enter the Gulf at all - although at the time of writing the Strait of Hormuz appears almost completely closed as it is.

From the perspective of Washington’s allies, the calculus would therefore be complex. Gulf Arab states have long feared Iranian aggression, yet they are equally wary of becoming the immediate theatre of a major war between the United States and Iran. An American occupation of Kharg Island would place the entire region on a wartime footing.

Furthermore occupying the island would not automatically end Iran’s ability to export oil. Tehran has explored alternative routes, including pipeline systems leading to ports outside the Persian Gulf. Smuggling networks and covert shipping arrangements would likely continue. While Kharg Island is crucial, it is not the only outlet through which Iranian hydrocarbons can reach global markets.

The question of casualties remains central. Modern Western militaries are extremely sensitive to losses in expeditionary operations. Even a relatively successful assault that cost several hundred lives could prove politically controversial in Washington. Amphibious warfare is inherently dangerous, and the confined geography of the Gulf magnifies those dangers.

For this reason many strategists believe that air power and economic pressure remain more likely instruments than territorial seizure. Precision strikes against infrastructure, naval interdiction of shipping and cyber operations targeting oil logistics could achieve similar objectives without requiring the permanent occupation of Iranian soil.

Yet military planners often consider contingencies that appear unlikely in normal circumstances. If the conflict between Iran and the United States were to escalate dramatically, options that today seem remote might move into the realm of serious discussion. Kharg Island would inevitably appear on the operational map because of its central role in Iran’s energy system.

The island represents a paradox common in modern warfare. It is small enough to capture but important enough to provoke enormous consequences. Taking Kharg Island might be militarily feasible under conditions of overwhelming American air and naval superiority. Holding it, however, would involve sustained exposure to Iranian retaliation and a significant risk of regional escalation.

For the United States the strategic advantage would lie primarily in economic leverage. Control of the island would constrict Iran’s oil revenues and symbolise American dominance in the Gulf. For Iran the island would become a rallying point of national resistance, a fragment of territory whose loss demanded eventual recovery.

Thus the question is not merely whether Kharg Island could be seized. It is whether the political and strategic consequences of doing so would advance the broader objectives of the war. In conflicts fought around narrow seas and vital resources, small islands often acquire enormous significance. Kharg Island is one such place, a limestone platform upon which the balance of power in the Persian Gulf might, in theory, briefly turn.