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
Sankamphaeng Range the southern end of the Dong Phaya Yen Mountains, which run roughly in a north-south direction at the southwestern boundary of the Khorat Plateau. To the east this range connects with the Dângrêk Mountains, a longer system running in an east-west direction that stretches into Laos. The southern mountainsides of the range drain into the Prachinburi River. The range is divided in two compact massifs where the highest elevations are in the west. The highest point in the Sankamphaeng Range is the 1,351 m high Khao Rom, also known as Khao Khiao. Other peaks are 1,326 m high Khao Laem,