Oman Oil Spill: 40km Coast Polluted by Shadow Fleet Tanker

Oil from the leaking tanker Caroline Bezengi has reached the mainland coast of Oman, polluting a roughly 40-kilometer stretch near the coastal town of Ras Madrakah. The Oman oil spill has also washed ashore on several nearby islands, and satellite analysis suggests the slick is far larger than official reports indicate, making it one of the most serious environmental incidents in the region in years.

What is the Caroline Bezengi oil spill?

The Caroline Bezengi is an EU-sanctioned tanker that was part of Russia's shadow fleet, a network of aging vessels used to move Russian crude while evading Western sanctions. The ship departed the Russian Black Sea port of Novorossisk in April 2026, reportedly carrying up to one million barrels of crude oil bound for India. It ran aground off Oman's Al-Qibliyyah Island more than six weeks ago after explosions on board, the cause of which remains unclear. This incident echoes long-standing warnings about the Russian shadow fleet environmental risks posed by uninsured, aging tankers operating without proper oversight.

Oil slick grows beyond official estimates

Last Monday, Omani authorities said roughly 400 square kilometers had been covered with oil. Greenpeace separately estimated the slick at about 600 square kilometers. But Reuters reports the disaster is likely far worse: satellite images analyzed by an expert suggest the slick now exceeds 2,000 square kilometers, which would rank it among the largest oil spills in recent years. The first confirmed landfall on the Omani mainland came this week, when oil reached beaches at Ras Madrakah. Officials said a 40-kilometer coastal strip has been polluted, and the southern beaches of Masirah Island could be affected within hours.

Why is the spill hard to contain?

The Khareef monsoon has severely limited access to the stranded vessel and delayed any salvage effort. 'The monsoon has limited access to the ship and delayed salvage operations,' a spokesperson for the International Maritime Organization (IMO) told Reuters. The UN body confirmed that crude oil has washed ashore on the mainland, though it remains unclear whether any oil is being cleaned up or whether a salvage attempt is underway. Oman's Environment Authority has deployed aerial surveillance, technical monitoring, and numerical models to track the slick, but rough seas have forced responders to rely on floating booms and absorbents.

Threat to a protected marine reserve

The affected area lies near the Hallaniyat Islands, a protected nature reserve designated by Oman in 2025. The archipelago is known for pristine coral reefs, endangered Loggerhead and Green turtle nesting grounds, and the rare Arabian Sea humpback whale. Experts warn that the Oman coral reef ecosystems could suffer long-term damage, as the region's mixed coral-algal habitats and endemic species are highly sensitive to oil contamination.

What wildlife is at risk?

• Loggerhead, Green, and Hawksbill turtles that nest on the islands
• The endangered non-migratory Arabian Sea humpback whale
• Endemic Oculinidae corals and mixed coral-algal reefs
• Seabird colonies, including Red-billed Tropicbirds and Masked Boobies

Geopolitical tensions and the shadow fleet

If an attack caused the explosion, it has never been claimed. The blast occurred off Oman's coast, where both the Houthis and Iran have targeted numerous ships. Ukraine has also carried out multiple strikes on vessels in the Russian shadow fleet, though no group has taken responsibility for this incident. The broader sanctions on Russian oil have pushed Moscow to rely on a shadow fleet that now numbers over 1,300 vessels, according to Ukrainian intelligence, raising the risk of more spills in sensitive waters.

FAQ

Where did the Oman oil spill happen?

The spill originated from the tanker Caroline Bezengi, grounded off Al-Qibliyyah Island in southern Oman's Dhofar Governorate. Oil has now reached the mainland near Ras Madrakah.

How large is the oil slick?

Oman officially reported about 400 square kilometers last Monday, but Reuters analysis of satellite images suggests the slick has grown to more than 2,000 square kilometers.

What is the Russian shadow fleet?

The shadow fleet consists of aging, often uninsured tankers used to move crude for sanctioned countries such as Russia, Iran, and Venezuela outside Western oversight. The Caroline Bezengi is under EU sanctions.

Why is the spill difficult to clean up?

The Khareef monsoon brings rough seas that limit access to the ship, forcing responders to use floating booms and absorbents rather than larger equipment.