Neighbouring mountains include the high northwest and the high close to Negriales de Lastarria in the southwest. Almost due north of Lastarria lies the , a salt pan with a waterbody that is almost a lake, its name is a reference to the sulfur deposits of Lastarria. This waterbody may be a source of water for the fumarolic system Water levels in the lake were higher in the past, as evidenced by two recognizable shorelines, and the lake's surface area reached .