The problem of single-use plastics winding up in the world's ocean couldn't get much clearer than in Indonesia where as much as six kilograms of plastics were found in a dead Sperm Whale's belly.

"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.

The 9.5 meter whale washed ashore near Kapota Island in the Wakatobi National Park late on Monday.  The body was badly decomposed, so it's really not clear what killed it.  But environmentalists were alarmed about the contents of its stomach: 115 drinking cups, four plastic bottles, 25 plastic bags, and two thongs.

A 2015 report by environmental campaigner Ocean Conservancy and the McKinsey Center for Business and Environment showed that as much as 60 percent of the plastic waste that ends up in oceans come from five nations:  Indonesia, China, the Philippines, Vietnam, and Thailand.

In June, a Pilot Whale in southern Thailand died while vomiting plastic bags even as rescuers tried in vain to save it.  An examination found that it had injested 80 plastic bags, making it impossible to eat.

The United Nations earlier said marine life was facing "irreparable damage" from the approximately 10 million tons of plastic waste ending up in the oceans every year.