At the heart lies the Tonle Sap (Great Lake), which dominates the landscape and hydrology.

Because these areas are the most accessible and fertile, they host the majority of the population and the historic capital of Phnom Penh , which sits at an average elevation of just 13 meters. The Mountainous Rim

For interactive exploration, resources like the USGS (United States Geological Survey) or specialized GIS platforms, such as OpenDevelopmentCambodia, offer detailed terrain maps.

This low-lying depression forms the heart of the plains. It houses the Tonle Sap (Great Lake), a unique hydrological wonder that expands up to five times its dry-season size during the monsoon.

A reveals a distinct dish-shaped landscape characterized by a low-lying central alluvial plain completely encircled by uplands and rugged mountain ranges , with the country's lowest points meeting the southwest coast at the Gulf of Thailand . Spanning approximately 181,035 square kilometers, Cambodia’s elevation profiles show that over 75% of the landmass sits within the central basin, dropping to fewer than 10 meters above sea level around the iconic Tonle Sap Lake .

Topography and water are inseparable in Cambodia. The physical elevation drops dictate a dramatic aquatic system.