Sajama National Park is Bolivia's oldest national park. The park lies within the Central Andean dry puna ecoregion. It features a spectacular Andean landscape, with elevations ranging from 4,200 to 6,542 meters (13,780 to 21,463 ft). It contains the snowy cone of the volcano Sajama, the highest mountain in Bolivia at 6542 meters. The park also includes the Payachata volcanic group.
The area was declared a nature reserve in 1939 because of the native Queñoa De Altura (Polylepis tarapacana) that grows on the hillsides of this region. This shrub-like tree has adapted to the high elevations and harsh climate of the Andes. At the time that the area was declared a national park, rampant harvesting of this tree was taking place to create charcoal to supply Bolivian mines.
On July 1, 2003, it was added to the UNESCO World Heritage Tentative List due to its universal cultural and natural significance. (Wikipedia)