'young boiling one' – perhaps a reference to earlier eruptions – or 'where young were boiled', which may refer to human sacrifices. Other names for the volcano include Chequepuquina, Chiquimote, Guayta, Omate and Quinistaquillas. The volcano El Misti was sometimes confused with and thus referred to mistakenly as Huaynaputina. Geography The volcano is part of the Central Volcanic Zone of the Andes. Other volcanoes in this zone from northwest to southeast include Sara Sara, Coropuna, Ampato, Sabancaya, El Misti, Ubinas, Ticsani, Tutupaca and Yucamane. Ubinas is the most active volcano in Peru; Huaynaputina, El Misti, Sabancaya, Ticsani, Tutupaca, Ubinas and Yucamane have been active in historical time, while Sara Sara, Coropuna, Ampato, Casiri and Chachani are considered to be dormant. Most volcanoes of the Central Volcanic Zone are large composite volcanoes that can remain active over the span of several million years, but there are also conical stratovolcanoes with shorter lifespans. In the Central Volcanic Zone, large explosive eruptions with Volcanic Explosivity Index of 6 and higher occur on average every 2,000 to 4,000 years. Huaynaputina is in the Omate and Quinistaquillas Districts, which are part of the General Sánchez Cerro Province in the Moquegua Region of southern Peru. The town of Omate lies southwest of Huaynaputina. The city of Moquegua is south-southwest of the volcano and Arequipa is to its north-northwest. The region is generally remote and the terrain extreme, the area around Huaynaputina is not easily accessible and human activity low. Within of Huaynaputina there are a number of small farms. A cattle-grazing footpath leads from Quinistaquillas to the volcano, and it is possible to approach the volcano over surrounding ash plains. The landscapes around the volcano have unique characteristics that make them an important geological heritage. Structure Huaynaputina lies at an elevation of about . It consists of an outer composite volcano, or stratovolcano, and three younger volcanic vents nested within an amphitheatre that is wide and deep. This horseshoe-shaped structure opens eastwards and is set in the older volcano at an elevation of . The amphitheatre lies at the margin of a rectangular high plateau that is covered by about thick ash, extending over an area of . The volcano has generally modest dimensions and rises less than above the surrounding terrain, but the products of the volcano's 1600 eruption cover much of the region especially west, north and south from the amphitheatre. These include pyroclastic