Grands thermes de Bagnères-de-Bigorre, Thermal treatment center in Bagnères-de-Bigorre, France.

The Grands Thermes de Bagnères-de-Bigorre is a thermal bath facility in the Pyrenees that draws warm mineral water from natural springs located deep underground. The center offers treatment programs tailored to different health conditions and welcomes both patients and visitors seeking the benefits of thermal waters.

Marie-Thérèse-Charlotte, daughter of Louis XVI and the Dauphine, laid the first stone of the Thermes Marie Thérèse in 1823; the building was inaugurated in 1828. This classical 19th-century structure is the ancestor of the present Grands Thermes, now managed by SEMETHERM Dt.

The name recalls Marie-Thérèse-Charlotte, daughter of Louis XVI, who laid the first stone of the Thermes Marie Thérèse in 1823; the building was inaugurated in 1828. The gold letters "GRANDS THERMES" on the facade mark the entrance, where three arched doorways open beneath a round clock.

The Grands Thermes treats rheumatology, psychosomatic and respiratory conditions, and a cure can combine two of these orientations. The water is captured by two boreholes, Reine and Régina, at nearly 200 metres depth and emerges naturally at 50 °C. The building is on the town's thermal quarter in Bagnères-de-Bigorre, Hautes-Pyrénées.

The water is captured at about 200 metres depth by two boreholes, Reine and Régina, which shield it from surface pollution. Rainwater seeps underground, reaching up to 1,000 metres and travelling for decades, dissolving sulphate, calcium and magnesium salts along the way.