Tinguiririca Volcano, Stratovolcano in O'Higgins Region, Chile

Tinguiririca is an active stratovolcano in the Andes of Chile's O'Higgins Region, in San Fernando commune, Colchagua province, reaching 4,260 m. Its summit crater holds constant fumarolic activity within and on its northwest wall, and hot springs and fumaroles appear on the western flanks.

The mountain gained worldwide attention in 1972 when a Uruguayan Air Force plane crashed in the area, triggering a 72-day survival story. This event linked the volcano to one of the most noted survival cases of the 20th century.

The volcano's name comes from the Mapudungun words for the Tinguiririca river valley where it stands, and the summit crater and western flanks show constant fumarolic activity that visitors can observe. Its 1917 eruption is the last recorded, and geologists classify it as an explosive-type hazard.

Climbing requires proper mountain gear and experienced guides due to the altitude and rough terrain. San Fernando serves as the main base town where expeditions can be organized and preparations made.

The summit crater's northwest wall and the western flanks both release constant fumarolic activity, with hot springs and fumaroles visible on the western slopes. Sernageomin records only sparse historical data: eruptions in 1779 and 1830, a last eruption in 1917, and fumarolic activity since then.