The Khmer Empire, was a complex state in southeast Asia between AD 800 and 1400. It was remarkable, among other things, because of its extensive water management system stretching across over 1200 square kilometers, which connected the natural lake Tonle Sap to large man-made reservoirs (called baray in Khmer) through a series of canals and permanently altering the local hydrology.
Four major baray are in Angkor today: Indratataka (Baray of Lolei), Yasodharatataka (East Baray), West Baray, and Jayatataka (North Baray). They were very shallow, between 1-2 m below ground level, and between 30-40 m wide. Baray were built by creating earthen embankments of between 1-2 meters above the ground level and fed by channels from natural rivers. The embankments were often used as roads.
The capacity of Jayatataka Baray is 8.7 million m3 and its approximate surface area is 2.9 million m2.