WUHAN -- A 5,100-year-old dam, complete with a reservoir and spillway, has been identified as China's earliest known water conservancy project.
The Xiongjialing Dam is part of the Qujialing relics site in the city of Jingmen, Central China's Hubei province.
It was initially built around 5,100 years ago on a tributary of the Qingmudang River and was later expanded in both height and width, said Tao Yang with the Hubei Provincial Institute of Cultural Relics and Archaeology.