The thermal springs of Mont-Dore, now numbering twelve, were known to the Romans. Bicarbonate of soda, iron and arsenic are the principal ingredients of the waters, which are used both for drinking and bathing. Hot baths are characteristic of the treatment; they are believed to be efficacious for tuberculosis, bronchitis, asthma, and nervous and rheumatic paralysis. Due to the elevation and exposure of the valley, the climate of Mont-Dore is relatively severe, and the season only lasts from 15 June to 15 September.