I checked the map... the volcano (Puyehue-Cordon Caulle volcanic complex) is just across the border from San Carlos de Bariloche - where I rode horses at "Cabalgate Carol Jones" and rowed on Lago Nahuel Huapi and from San Martin de los Andes where I rented a car for my trip up to the Volcan Lanin! Check out my photos from March and you'll see the verdant forests and sparkling blue lakes of this region. Then imagine it all buried and clogged by heavy gray volcanic ash.
How transitory the earth's beauty can be...