Erupting geyser amongst the sinter deposits and steam plume - Tatio Geyser Field - Loa province - northeastern Antofagasta region - the largest geothermal field in the Southern Hemisphere, measuring about 12 mi² (30 km²) in surface area - this area is part of the Central Volcanic Zone, where the Andes Mountains is at its widest, due to the Nazca tectonic plate and ridge, being subducted under the South American plate, vulcanism extreme.