Jakarta: A dead whale that washed ashore in eastern Indonesia had a large lump of plastic waste in its stomach, including drinking cups and flip-flops, a park official said on Tuesday, causing concern among environmentalists and government officials in one of the world's largest plastic polluting countries.

Rescuers from Wakatobi National Park found the rotting carcass of the 9.5-metre sperm whale late Monday near the park in Southeast Sulawesi province after receiving a report from environmentalists that villagers had surrounded the dead whale and were beginning to butcher the rotting carcass, park chief Heri Santoso said.

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Santoso said researchers from wildlife conservation group WWF and the park's conservation academy found about 5.9 kilograms of plastic waste in the animal's stomach containing 115 plastic cups, four plastic bottles, 25 plastic bags, 2 flip-flops, a nylon sack and more than 1000 other assorted pieces of plastic.

"Although we have not been able to deduce the cause of death, the facts that we see are truly awful," said Dwi Suprapti, a marine species conservation coordinator at WWF Indonesia.