Thalasso de Bora Bora, in French Polynesia, offers treatments using sodium-chloride water drawn from the lagoon at around 35°C (95°F). A relaxing lagoon-side setting with pools facing Mount Otemanu.
Insider tip — The Bora Bora lagoon is the most photographed lagoon in the world — swimming with manta rays and harmless lemon sharks after your thalasso treatments, in turquoise water at 28°C, is the very definition of paradise.