It is unclear what caused the suspected leak on the island's west coast.
The company Orbital EOS, which monitors oil spills, told The New York Times that the leak on Thursday appeared to cover more than 52 square kilometers.
Suspected oil leak off Iranian island Kharg spreads over 52 square kilometers
Satellite images show a suspected oil leak spreading off the coast of the Iranian island of Kharg, through which almost all of Iran's oil exports pass.
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