Huari
The oldest known irrigation canals in the Americas are located in the Nanchoc District of Cajamarca Department. The canals in the Zaña Valley have been radiocarbon dated to 3400 BCE, and possibly date to 4700 BCE. From the 6th to the 10th century the people of the Wari culture ruled earlier cultures in the highlands. They established the administrative center of Wiraquchapampa.