San Pedro

San Pedro is one of the tallest active volcanoes in the world. It is located on the edge of the Atacama Desert, in Chile. San Pablo volcano is its neighbor to the east and from which is connected by a high saddle. Cerro Paniri volcano lies on the opposite side of the San Pedro River Valley. When climbing this volcano one has to wear a mask over the mouth to block out harmful toxins.

• http://en.wikipedia.org/wiki/San Pedro