1955 - Sihanouk abdicates to pursue a political occupation. His father turns into king and Sihanouk gets to be key minister. As the water level of the Mekong falls during the dry season, the process is reversed: h2o drains with the Tonle Sap back down in the Mekong, switching the course of its movement. due to this once-a-year phenomenon, the Tonl