| Portal | Thursday, April 25, 2024 03:31 hr PDT [UTC - 7] |
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| To refresh picture | Cumbemayo canal, Cajamarca, Peru, built c. 1,500 B.C. (2014) |
| Lagoa Chacorore, in the Upper Paraguay River Basin, Mato Grosso, Brazil | Portal Civil and Environmental Engineering SDSU |