Picture of the Andean highlands, farmed with Waru Waru technology, consisting of many raised fields in a patchwork optic. in the valley. Subtitle: At the Incan civilization's height in the 1400s, the system of terraces covered about a million hectares throughout Peru and fed the vast empire. Cynthia Graber Source: https://th-thumbnailer.cdn-si-edu.com/P3d-67l5_VNCbpXJLlv5eX0YwQc=/fit-in/1072x0/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/Inca-farming-ancient-terraces-7.jpg
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