About 400,000 litres of crude oil leaked from an undersea pipeline near Map Ta Phut in Rayong province on Tuesday.
The pipeline belongs to Star Petroleum Refining Public Company Limited (SPRC).
The Pollution Control Department said a slick 180,000-200,000 litres in size was heading to the shoreline between Mae Ramphueng beach and the Khao Laem Ya–Mu Ko Samet Marine National Park.
