Siem Pang sits in Cambodia’s Mekong-Tonle Sap basin, the low-lying heart of the country where the wet season runs from roughly May through October and the Tonle Sap Lake’s famous seasonal flood pulse, in which the Tonle Sap River reverses direction each year, drives much of the region’s flooding.
In Stung Treng province along the Sekong River, the town’s remote location means river levels are closely watched as an early indicator of downstream flooding. Major Mekong flood years, including 2000, 2011, and 2013, showed how a wet monsoon season upstream can raise water levels across this entire basin for weeks at a time, and Cambodia’s Ministry of Water Resources and Meteorology uses radar alongside river gauges to track both direct rainfall and the river system’s slower, larger rises. Learn more: Flash Flood Warning Signs on Radar · Open the full Rain Map