Incahuasi Central Volcanic Zone of the Andes together with about 110 other Quaternary volcanoes, and lies in the southern sector of the volcanic zone; other volcanic zones in the Andes are the Northern Volcanic Zone, the Southern Volcanic Zone and the Austral Volcanic Zone. The history of volcanic activity is poorly known for most of these volcanoes owing to the lack of dating; only a few historical eruptions have been recorded, such as an eruption at Ojos del Salado in 1993. Incahuasi is located northeast of Ojos del Salado, the highest volcano in the world. Both volcanoes are found at the
Pioneer Mountains (Montana) Pioneer Mountains (Montana) The Pioneer Mountains cover in Beaverhead County in southwestern Montana, USA. The highest peaks in this range include: The Pioneer Mountains are divided into two subranges by the paved Wise River Road: the East Pioneers and West Pioneers. The highest mountains in the entire range are in the East Pioneers - Tweedy Mountain and nearby Torrey Mountain, these two peaks are the highest on the Beaverhead National Forest. The two subranges are quite different from each other in appearance. The East Pioneers have rugged, heavily glaciated peaks. About of the East Pioneers are roadless, and the range