A breakthrough LiDAR survey in the remote Xieng Khouang province of Laos has identified a previously unknown terraced agricultural citadel belonging to a high-altitude civilization that thrived around 1,000 BCE. The data reveals a sophisticated urban grid featuring massive defensive stone walls, circular residential platforms, and a complex network of artificial irrigation canals that gravity-fed water across miles of mountain terraces.
This discovery challenges current understanding of Southeast Asian prehistory, suggesting that the region's highlands supported large, organized populations long before the construction of the famous Plain of Jars. Lead researchers emphasize that the citadel's layout demonstrates advanced knowledge of hydraulic engineering and soil management, allowing the inhabitants to cultivate rice and other staples on steep, high-altitude slopes that were previously thought to be uninhabitable by large permanent settlements.