Thermes d'Hell-Bourg, Former thermal baths in Hell-Bourg, Réunion Island, France.

The Thermes d'Hell-Bourg are the ruins of a 19th-century thermal bath establishment on the right bank of the Bras Sec, west below the village of Hell-Bourg. The site preserves low walls of rough dark grey stone with lighter mortar, a circular stone basin with a small central upright stone, and rusted metal fittings including a flat wheel, a small drum, a cylinder and a pipe section. A two-storey rectangular building with a dark hipped roof has open verandas on both levels, supported by slender posts with railings, and a masonry base wall with a metal fence below.

The thermal complex was built in 1852 following the discovery of the springs by hunters in 1831, establishing the foundation for Hell-Bourg's growth as a village. This sequence shows how natural resources drove the development of new settlements on the island.

The thermal establishment served as a gathering place where wealthy visitors spent time together in styled rooms and shared spaces. It shows how these springs shaped a new kind of social life on the island during that era.

The ruins can be reached via a trail of about 30 minutes round trip starting from the end of General de Gaulle Street in the village. Wear sturdy footwear as the path crosses uneven ground through the surrounding forest.

The two springs, at 872 metres, yielded about 1,000 litres an hour at 32 °C. A 1943 landslide buried one spring; a 1948 cyclone triggered a second landslide that buried the other and destroyed parts of the installations. The sources cooled and eventually dried up, ending the spa.