Archaeologists in China have discovered one of the ancient world's largest water engineering projects in what is today the Zhejiang Province. After four years of excavations and study, the research team was able to confirm that the water system along the Yangtze River Delta dates back 5,100 years, making it the oldest project in the world; 200 years older than a similar site discovered in Mesopotamia which was built around 4,900 years ago.
The scientific crew, made up of researchers from various Chinese institutes, believes that the intricate system was built by approximately 3,000 workers and took nearly a decade to be completed.