Nevados de Payachata, a pair of volcanoes, is included in the 620 volcanoes that can be found in the Andes mountain range. Parinacota is the youngest of the pair and stands 20,827 feet (6,348 meters) high; the oldest, Pomerape, is 20,413 feet (6,222 meters) high.

(Photograph shot on assignment for, but not published in "Chile, Republic on a Shoestring," October 1973, National Geographic magazine)