Radar Helps Uncover Lost Metropolis
  NASA logo links to www.nasa.gov Radar Helps Uncover Lost Metropolis
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The Medieval Settlement of Angkor, Cambodia
artist drawing of people of Angkor Medieval Civilization
At its peak in the 11th to 13th centuries A.D., the medieval settlement of Angkor in Cambodia was home to more than a million people.

Sprawling north of Cambodia's Tonle Sap Lake, the largest fresh water lake in Asia, greater Angkor was a "hydraulic city," linked by an elaborate water management network that covered more than 1,000 square kilometers (about 400 square miles). It provided a stable water supply despite the unpredictable monsoon season.

Image credit: Tom Chandler, Monash University, Melbourne, Australia
  Jet Propulsion Laboratory
   California Institute of Technology