Which is the world's highest volcano?Answer 1 - highest volcano with historic activity:
The highest historically active volcano in the world is Llullaillaco at 6739 m (22,109 feet). Llullaillaco is on the border between Chile and Argentina in the Atacama Desert, one of the world's driest places.
Answer 2 - highest active volcano:
The highest active volcano in the world is Ojos del Salado on the Chile-Argentina border in the Central Andes. It rises to 6887 m / 22,595 ft. It has not erupted in historic times, but is an active volcano. A major explosive eruption occurred ca. 1000-1500 years ago, and future eruptions are very likely.
10 highest volcanoes in the worldAll the 10 highest active volcanoes in the world are all located on South America in the Central Andes of Northern Chile, Argentina, and Peru, with the exception of Chimborazo volcano in Ecuador, which belongs to the Northern Volcanic Zone:
1) Ojos del Salado 6887 m / 22,595 ft, Chile / Argentina, no historic eruptions
2) Llullaillaco 6739 m / 22,109 ft, Chile / Argentina, last eruption 1877
3) Cerro Tipas 6660 m / 21,850 ft, Argentinia, no historic eruptions
4) Cerro El Condor 6532 m / 21,430 ft, Argentinia, no historic eruptions
5) Coropuna 6377 m / 20,922 ft, Peru, no historic eruptions
6) Parinacota 6348 m / 20,827 ft, Chile, ca. 2000 years ago
7) Chimborazo 6310 m / 20,702 ft, Ecuador, ca. 1500 years ago
8) Pular 6233 m / 20,449 ft, Chile, 1990 (?)
9) Aucanquilcha 6176 m / 20,262 ft, Chile, no historic eruptions
10) San Pedro 6145 m / 20,161 ft, Chile, 1960 (?)