At the northern edge of the Salar de Uyuni towers the Tunupa Volcano above the salt lake. On a day trip it is possible to hike to the crater rim at about 5,000 m or even further direction the top of the mountain. The base for the hike is in the tiny village of Coquesa, where there is not much more than a few houses and a hostel. From there you can start hiking but it makes it definitely a little easier to be driven some hundreds of meters uphill close to some caves with mummies at about 4,000 m. The hike from here is quite strenuous, especially approaching the edge of the crater where the terrain is sandy with small stones. The views are amazing though and worth the effort. When you stand about 1,500 meters above the salar you quickly forget the tough climb.