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Scientists' work in Peru's northern Zaña Valley in 1989 discovered what ancient artefacts, a mitigation.................

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Scientists' work in Peru's northern Zaña Valley in 1989 discovered what ancient artefacts, a mitigation of the valley's dry climate?

posted May 24 by Samardeep Acharya

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Stone-lined irrigation channels, canals or aqueducts, from 0.6 to 2.5 miles (1 to 4 km) in length
The canals are estimated to be around 5,400 years old.

answer May 25 by Tapesh Kulkarni
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