Satellite images showed a large suspected oil slick west of Iran’s Kharg Island on May 6, a development that put the Persian gulf back under scrutiny. The dark streak appeared after months in which Iranian crude kept moving through a storage system already under pressure, with onshore tanks at Kharg Island filling first in mid-April.
The slick near Kharg covered more than 120 square kilometres. True-colour images showed vessels nearby, some apparently engaged in loading or transfer work, while Sentinel-1 radar data was used to check whether the dark streaks were likely oil.
Kharg Island Export Pressure
Iran produces over three million barrels of crude oil per day, and the majority of Iran's crude oil flows through its main export terminal at Kharg Island. As the blockade took hold in mid-April, Iranian authorities revived several old tankers for use as floating storage offshore, but the storage space appears to have tightened quickly around the export hub.
Satellite imagery had already shown suspected slicks near the Kuwait coast on March 5, around Lavan Island on April 10, and off Qeshm Island on April 22. The May 6 slick west of Kharg Island fits that earlier pattern, with multiple dark streaks appearing across the Persian Gulf and around the Strait of Hormuz in recent weeks.
Satellite Evidence Near Kharg
Experts said satellite views alone cannot prove the substance is oil, so the images point to a likely discharge rather than a laboratory result. Even so, the size of the slick and the vessel activity nearby make the Kharg area the clearest focal point in the sequence of sightings.
Iran cannot simply shut down oil production because doing so risks severe and potentially permanent damage to underground reservoirs. When wells are shut in for extended periods, water and gas can intrude into rock formations, permeability can decline, and sediment or paraffin can clog pores and pipelines.
Persian Gulf Livelihoods
The Persian Gulf supports fishing communities, coral reefs, and rich marine life that provide food and income for coastal families in the region. Oil floating on the surface can poison fish, harm seabirds, and damage fragile habitats, so a slick of this scale reaches far beyond the waters west of Kharg Island.
For families who depend on those waters, the practical concern is whether more dark streaks will appear around Kharg and whether offshore storage can absorb the pressure now building around Iran's export route. The next visible check will come from another satellite pass over the island and the surrounding sea.
