Thermas de Gravataí, in Santa Catarina state, Brazil, taps thermal water at 36°C. An indoor bath, an outdoor rotenburo-style pool, a sauna, and massage are all available at this southern Brazil site.
Insider tip — Thermas de Gravatal is tucked into the forested hills of Santa Catarina state, where warm thermal waters feed a cluster of resort pools amid Atlantic Forest remnants. The surrounding vale is cool and humid even in summer, making the contrast between ambient air and 36°C pool water especially pleasant. Visit on weekday mornings to avoid weekend crowds from Florianopolis.