Bon Om Touk (Cambodian Water & Moon Festival), the annual boat rowing contest, is the most attended Cambodian national festival. Held at the end of the rainy season when the Mekong River begins to sink back to its normal levels allowing the Tonle Sap River to reverse flow, approximately 10% of Cambodia's population attends this event each year to play games, give thanks to the moon, watch fireworks, dine, and attend the boat race in a carnival-type atmosphere.