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
Entiat Mountains stretch south to the Columbia River between the mouths of the Entiat and Wenatchee Rivers. The northern end the Entiat Range merges with the northern end of the Chelan Mountains. Most of the range is within Wenatchee National Forest. The northern end is part of the Glacier Peak Wilderness. The highest peak of the Entiat Mountains is Mount Fernow, at . Other major peaks include Seven Fingered Jack, Mount Maude, Copper Peak, Dumbell Mountain, Spectacle Buttes, and Buckskin Mountain. All these peaks are over and the three highest are over . They are all located in the northern part of