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11th century CEReputable source · 2 sourcesDebated

The Western Baray, the Largest Reservoir of the Angkor Period

A reservoir 16 square kilometers wide anchors the empire's water-management system

On the timeline · around 11th century CE · Temple-Mountains and Angkor WatTemple-Mountains and Angkor WatThe Western Baray, the Largest Reservoir of the Angkor Period10001025105010751100

Quick facts

Reservoir
Western Baray, 8 x 2 km
Capacity
About 53 million cubic meters
Center temple
West Mebon, built by Udayadityavarman II
Key find
Bronze reclining Vishnu statue fragments, excavated 1936

What happened

Khmer kings kept scaling up their reservoirs through the 10th and 11th centuries, culminating in the Western Baray, the largest built during the entire Angkor period. According to the National Library of Australia's account of Khmer engineering, it measures about 8 by 2 kilometers, 16 square kilometers in total, and once held an estimated 53 million cubic meters of water, roughly 21 Olympic swimming pools. Earthen dykes built from clay and soil dug out of the reservoir basin held the water; in some cases whole rivers were diverted to fill the barays. At its center stands the West Mebon, a temple built in the 11th century by King Udayadityavarman II that became an island when the reservoir was full. In 1936 archaeologists recovered fragments of a colossal bronze reclining statue of Vishnu from the site, suggesting the temple once depicted the god reclining on the cosmic ocean.

Why it matters

Scholars are divided on whether these barays were primarily practical irrigation infrastructure or ritual objects symbolizing cosmic waters, and the debate matters because it shapes how historians read the later collapse: if the barays were mainly religious, their failure late in the empire's life was a spiritual crisis as much as a farming one.

How we know

The reservoir's dimensions come from archaeological and lidar survey of the still-visible dykes; the Vishnu statue fragments were physically excavated in 1936, giving direct material evidence for the Mebon's religious function.

Sources

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