The Chao Phraya River is born from mountain streams in northern Thailand, flowing hundreds of kilometers south to the sea. By the time the river travels through Bangkok and empties into the Gulf of Thailand, it is carrying huge quantities of plastic waste – an estimated 4,000 metric tons every year, equal to the weight of 26 blue whales. The plastic clogs the river along its course, drastically impacting communities and the waterway’s ecology.

The Third Pole traveled from the Chao Phraya’s beginnings to the sea to explore what’s happening to one of Southeast Asia’s most important rivers.