Thai river turns orange as dangerous toxins from Myanmar mines flush downstream

South China Morning Post

28-05-2025

Dangerous levels of arsenic in a northern
Thai river contaminated by chemicals used in mines across the border in
Myanmar risk unleashing an unprecedented ecological disaster on the kingdom's waterways, environmentalists have warned, as images of the orange-yellow waters go viral.
Advertisement
Bangkok is seeking renewed talks with Myanmar's junta to stop the toxic sediment flowing downstream into the Kok River, which runs from Shan State, in Myanmar through Thailand's border province of Chiang Rai.
But the urgency of the health crisis for riverside communities – who have been warned not to wash, drink or eat fish from the contaminated waterway they depend on – is compounded by the fact that the mines are located in territory controlled by the Wa, an ethnic armed group notorious for drug production, unchecked resource extraction and opaque business ties to China.
Thai villagers started to notice the discolouration of the water in March.
Fishermen on the Chiang Saen river. Photo: Earth Thailand
However, satellite imagery suggests the contamination began as early as last September, when large upstream forest areas in Myanmar were cleared for mining – initially thought to be for gold, but now suspected to involve rare earths, based on the volume of chemical effluent released into the river.