Termas de Copahue

Termas de Copahue sits at 2,100 meters altitude, 19 km from Caviahue, at the foot of the active Copahue volcano — whose name means 'place of sulfur' in Mapuche. Waters here range widely in temperature (29°C-70°C) and acidity (pH 2-7) across different springs, and are classified as sulfated, sulfurous, ferruginous, carbogaseous, calcium-and-sodium bicarbonated, containing bicarbonate, potassium, lithium, calcium, magnesium and silica. Access for medicinal use dates to 1870, when an Argentine physician obtained permission from Mapuche leaders to bring patients to the springs; the resort now offers mud therapy, vapor baths, immersion pools and Hubbard tanks for rheumatic, dermatological, respiratory and digestive conditions, with capacity for around 2,000 treatments a day. It operates seasonally, December through April, due to heavy winter snowfall.