Marking the end of the monsoon season, the Cambodian Water Festival of Bon Om Tuk is a centuries-old thanksgiving tradition.
The torrential rains of the monsoons cause a curious and unique natural phenomenon to occur. The waters of the Mekong swell, forcing the Tonle Sap River to reverse direction and flow upstream away from the sea.
The waters pour into Tonle Sap Lake, making it the largest freshwater lake in Southeast Asia for a few weeks and bringing with it an abundance of fish which have fed generation after generation of the Khmer people.
In full: https://www.discoverydcode.com/dcode/articles/how-wild-is-cambodias-water-festival/