This vast festival is probably the most extravagant festival in the calendar. Over three days starting with the last full moon day in October or the beginning of November up to a million people from all walks of life from all over the country flock to the banks of Tonle Sap and Mekong Rivers in Phnom Penh to watch hundreds of brightly colored boats with over 50 paddlers battle it out for top honors.
The boat racing dates back to ancient times marking the strengths of the powerful Khmer marine forces during the Khmer empire. In the evening brightly decorated floats cruise along the river prior to and complimenting the fireworks displays. there is often a parallel festival at Angkor Wat and although it is smaller in scale it is just as impressive due to the backdrop of Angkor Wat.
The festival marks the changing of the flow of the Tonle Sap and is also seen as thanksgiving to the Mekong River for providing the country with fertile land and abundant fish. It is at this time when the river flow reverts to its normal down stream direction. The remarkable phenomenon that is the Tonle Sap sees the river flowing upstream during the rainy season and then change direction as the rains cease and the swollen Tonle Sap Lake empties back into the Mekong River leaving behind vast quantities of fish.