Tonlé Sap
The stampede occurred at the end of the three-day Water Festival to celebrate the end of the monsoon season and the semiannual reversal of flow of the Tonlé Sap river. Initial reports suggest that festival-goers had gathered on "Koh Pich" ("Diamond Island"), a spit of land stretching into the Tonlé Sap, to watch boat races and then a concert. Around four million people had attended the festival.