The Mysterious Moray Agricultural Terraces of the Incas

One of the most visually stunning Inca ruins is at Moray, an archaeological site in Peru approximately 50 km northwest of Cuzco and just west of the village of Maras. In a large bowl-like depression, is constructed a series of concentric terraces that looks like an ancient Greek amphitheater. The largest of these terraces are at the center – they are enormous in size, and descend to a depth of approximately 150 meter, leading to a circular bottom so well drained that it never completely floods, no matter how plentiful the rain. The concentric terraces are split by multiple staircases that extend upward like spokes of a wheel and enable people to walk from the top to the bottom of the bowl. Six more terraces, in connected ellipses rather than perfect circles, surround the concentric heart of Moray, and eight terraced steps that cover only a fraction of the perimeter overlook the site. The purpose of these depressions is uncertain, but the most widely agreed theory is they used to serve as ‘agricultural research station’. Photo credit One of the most remarkable feature of the site is the vast difference in temperature that exist between the top and the bottom reaches of the structure, which can be as much as 15°C. This large temperature difference created micro climates, similar to what is achieved in greenhouses in modern times, that was possibly used by the Inca to study the effects of different climatic conditions on crops. It is no coincidence that the temperature difference corresponds to the natural difference between coastal sea level farmland and Andean farming terraces 1,000 meters about sea level. Furthermore, pollen studies indicate that soils from different regions of the Inca empire was imported to each of the large circular terraces.