Bon Om Touk, or the Cambodian Water Festival, is an annual three-day festival that started in Phnom Penh on Nov. 2. The festival marks a reversal of the flow from the Mekong River to the Tonle Sap, marking the end of the rainy season. /Chinanews Photo

The festival is a time to give thanks to the river, as is an abundant water source for fertile farming and fish. /Chinanews Photo

The Water Festival is also known for its boat races. The history of the races can be traced back to the times of the Angkorian kings who trained their water warriors in fighting skills by holding competitions on the river. /Chinanews Photo

270 boats will participate in the boat races this year, 13 more than last year. The boat races on the Mekong River and the carnival atmosphere attract millions of people from all over the country. /Chinanews Photo