Moray is a set of unusual Inca ruins, mostly consisting of several enormous terraced circular depressions, the largest of which is approximately 30 m (98 ft) deep. As with many other Inca sites, it also has a sophisticated irrigation system.The purpose of these depressions is uncertain, but their depth, design, and orientation with respect to wind and sun creates a temperature difference of as much as 15 °C (27 °F) between the top and the bottom. It is possible that this large temperature difference was used by the Inca to study the effects of different climatic conditions on crops. Speculation about the site has led to discussion about Moray as an Inca agricultural experiment station. (Moray, Peru, 2016.)