Advanced Ancient Waterways of Khmer Engineering Unearthed at Angkor Thom

Siem Reap, March 20, 2026 — A month-long archaeological study by the APSARA National Authority at the former Royal Palace of Angkor Thom has revealed advanced ancient waterways that highlight the sophistication of Khmer engineering.

According to archaeologist Mr. Srun Tech, excavations at four sites uncovered soil deposits reaching up to three meters, along with a carefully constructed moat system featuring 9 to 11 laterite steps. The findings reflect the precision and durability of Khmer construction techniques.

The team also identified three ancient drainage systems at the base of the palace walls, consisting of six water outlets designed to channel water efficiently from the Royal Palace into the surrounding moat. These systems demonstrate the advanced hydraulic engineering skills of the Khmer civilization and their mastery of water management.

In addition, traces of an ancient pond were discovered on the northern side of the palace walls, built with 15 laterite steps, further showcasing the ingenuity behind the design and construction of Khmer waterways.

Mr. Srun Tech noted that these waterways were gradually buried over time due to natural and human factors. The ongoing excavation continues to provide valuable insights into the complexity and brilliance of ancient Khmer water management systems.

The APSARA National Authority plans to rehabilitate the ancient drainage system to restore its original function, helping to address seasonal flooding while preserving this important example of Khmer engineering heritage.

Source: APSARA National Authority, Published: March 20, 2026

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Reported by The Khmer Today