View from Mirador de Antahuilque in NW (downstream) direction. The Colca Valley has been inhabited since pre-Incan times, and ancient terraced farmlands are characteristic features of the valley. These terraces overlay a complex and weird-looking topography, which is the result of the interaction of volcanic processes, earthquakes, landslides, lake formation, and erosion by the Río Colca. Madrigal is shown near the right edge of the image. The area has been declared a UNESCO Global Geopark in 2019.