Pomerape is a stratovolcano

Stratovolcano

A stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions...

 lying on the border of Chile

Chile

Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

 and Bolivia

Bolivia

Bolivia officially known as Plurinational State of Bolivia , is a landlocked country in central South America. It is the poorest country in South America...

 (Oruro Department

Oruro Department

Oruro is a department in Bolivia, with an area of 53,588 km². Its capital is the city of Oruro. At the time of census 2001 it had a population of 391,870.- Provinces of Oruro :...

, Sajama Province

Sajama Province

Sajama is a province in the northwestern parts of the Bolivian department of Oruro.-Location:Sajama province is one of the sixteen provinces in the Oruro Department...

, Curahuara de Carangas Municipality, Sajama Canton). It is part of the Nevados de Payachata

Nevados de Payachata

Nevados de Payachata is a north-south trending complex of potentially active volcanos on the border of Bolivia and Chile, directly north of Chungará Lake. The complex contains two peaks, Pomerape to the north and Parinacota to the south. According to helium surface dating, Parinacota has erupted...

 complex of volcanoes together with Parinacota Volcano to the south. It is of Pleistocene

Pleistocene

The Pleistocene is the epoch from 2,588,000 to 11,700 years BP that spans the world's recent period of repeated glaciations. The name pleistocene is derived from the Greek and ....

 age.

Climbing the volcano is alpine AD grade, sometimes on 50+ degree snow/rubble slope. A camp can be established at 5,300m at the saddle between Parinacota and Pomerape. Depending on the season, the main difficulty can be penitentes

Penitentes

thumb|Penitentes are the name of the caps of the [[nazarenos]]; literally those doing penance for their sins.Penitentes, or nieves penitentes , are a snow formation found at high altitudes. They take the form of tall thin blades of hardened snow or ice closely spaced with the blades oriented...

which make the ascent physically difficult or impossible.