 Incahuasi lies on the border between Argentina and Chile, close to Paso San Francisco.A major road crosses the border there.Incahuasi is part of the 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.