It’s the time of the year again in Cambodia when, during the rainy season, the Tonle Sap Lake changes its size making it the largest freshwater lake in Southeast Asia.
Each year when the monsoon season begins, the waters from the Mekong river reverses to the Tonle Sap Lake, increasing its size to tenfold and engulfing the surrounding forests. Hence, the name, flooded forests. An example of which is shown in this picture:
As the Mekong flood water abates around November each year, the Tonle Sap water reverses and the fish swim out. This reversal of the current is marked and celebrated by holding Bon Oum Teuk, or Water Festival, in Phnom Penh. It is a national celebration and is the merriest and rowdiest celebrations, next to the Khmer New Year.