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
Salmon River Mountains rising to . The ten highest peaks are all in the eastern subrange, while the highest peak in the central mountains is Big Baldy, at . The highest mountain in the western subrange is North Loon Mountain, at . Salmon River Mountains The Salmon River Mountains are a major mountain range covering most of the central part of the U.S. state of Idaho. The range is over long and its boundaries are usually defined by the Salmon River and its large tributary forks. Part of the central Rocky Mountains, the entire range lies west of the Continental Divide of the