Angkor, which spans an area of nearly 155 mi² (400 km²) in modern-day Cambodia, was the thriving capital of the Khmer Empire which existed between the 9th and the 15th centuries AD.
When it reached its peak, Angkor, which was declared a World Heritage Site in 1992 by UNESCO, may have been home to as many as 1 million people.
Besides gaining control over regional trade, Angkor’s wealth heavily relied on large reservoirs created through jungle clearing and river regulation that fed an elaborate irrigation system creating an effective agriculture
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