Nevado Sajama, Extinct stratovolcano in Sajama National Park, Bolivia

Nevado Sajama is an extinct stratovolcano in Sajama National Park, Bolivia, reaching 6,542 meters above sea level. Its cone-shaped summit carries several lava flows and permanent ice fields that begin around 5,600 meters elevation.

Austrians Wilfrid Kühm and Josef Prem made the first ascent on 4 October 1939. The volcano itself is a compound structure, a stratovolcano built over several lava domes, and argon-argon dating gives an age of about 679,000 years for Sajama. Its last eruption is undated, possibly Pleistocene or Holocene.

The name Sajama derives from the Aymara words chak-jjaña, meaning "to the west"; other sources give chak xaña, "distant". The village of the same name at the western foot of the mountain had 276 inhabitants in the 2012 census.

Most climbs take two to three days from the base village of Sajama and require acclimatization along with warm clothing for the ice fields. Crampons and ropes are necessary for the upper section where wind can become strong.

The queñoa forests on the lower slopes grow up to 5,200 meters elevation, forming the highest forest zone on Earth. These gnarled trees survive thanks to their thick bark and slow growth rate in the thin air.