Researcher Khanasuan Kaeothip takes a water sample from the Kok River, in Chiang Saen, Thailand, on Feb. 17, 2026. (AP Photo/Anton L. Delgado)
Fisherman Sukjai Yana untangles his net while docked on the Kok River in Chiang Saen, Thailand, on Feb. 17, 2026. (AP Photo/Anton L. Delgado)
Sangrawee Suweerakarn, with the Romphoni Foundation, harvests tangerines on a farm in Tha Ton, Thailand, on Feb. 20, 2026. (AP Photo/Anton L. Delgado)
Farmer Lah Boonruang takes a break from harvesting banana bushels on a farm in Tha Ton, Thailand, on Feb. 20, 2026. (AP Photo/Anton L. Delgado)
Researcher Warakorn Maneechuket dissects a fish at a Naresuan University laboratory in Phitsanulok, Thailand, on Feb. 19, 2026. (AP Photo/Anton L. Delgado)
CHIANG SAEN, Thailand (AP) 鈥 A lone finger-length fish was a disappointing start to 75-year-old Sukjai Yana鈥檚 day. He recast his net from the bow of his long-tail fishing boat, slowly drifting towards the confluence of the Mekong and Kok rivers in northern Thailand.
Thailand is bearing the brunt as toxic runoff from rare earth mines in upstream Myanmar and Laos seep into the Mekong Basin, threatening millions who rely on its waters for farms and fisheries.
These heavy metal toxins imperil Southeast Asia's globally important, multi-billion-dollar produce industry, backbone of its developing economies.
鈥淭he Mekong and Kok Rivers are both a source of food and income, which gives life to the people,鈥 said Sayan Khamnueng of the Living Rivers Association. 鈥淭he river contaminants are the biggest transboundary issue we鈥檝e ever faced.鈥
Thailand鈥檚 response to the spreading problem has been limited to monitoring levels of heavy metals and educating communities about health risks. That raises concerns for Cambodia and Vietnam, downstream.
鈥淚f the contamination continues 鈥 the new generation (will) have to move to the city because they cannot continue their farmer鈥檚 life,鈥 said Sangrawee Suweerakarn of the Romphothi Foundation, an advocacy group for the Shan ethnic group.
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The Associated Press鈥 climate and environmental coverage receives financial support from multiple private foundations. The AP is solely responsible for all content. Find AP鈥檚 for working with philanthropies, a list of supporters and funded coverage areas at .
The Associated Press
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