Editing Irrigation (section)

====South America====
{{see also|Zaña Valley}}

The oldest known irrigation canals in the Americas are in the desert of northern Peru in the Zaña Valley near the hamlet of [[Nanchoc District|Nanchoc]]. The canals have been [[radiocarbon]] dated to at least 3400 BCE and possibly as old as 4700 BCE. The canals at that time irrigated crops such as [[peanut]]s, [[Cucurbita|squash]], [[manioc]], [[chenopodium|chenopods]], a relative of [[Quinoa]], and later [[maize]].<ref name="Dillehay, 2005">{{cite journal |last1=Dillehay |first1=Tom D. |last2=Eling |first2=Herbert H. Jr. |last3=Rossen |first3=Jack |year=2005 |title=Preceramic irrigation canals in the Peruvian Andes |url=https://www.pnas.org/content/pnas/102/47/17241.full.pdf |url-status=live |journal=Proceedings of the National Academy of Sciences of the United States of America |publisher=National Academy of Science |volume=102 |issue=47 |pages=17241–17244 |bibcode=2005PNAS..10217241D |doi=10.1073/pnas.0508583102 |pmc=1288011 |pmid=16284247 |archive-url=https://ghostarchive.org/archive/20221009/https://www.pnas.org/content/pnas/102/47/17241.full.pdf |archive-date=2022-10-09 |access-date=20 November 2020 |doi-access=free}}</ref>