Thermes Lédonia, Roman thermal baths in Lons-le-Saunier, France
Thermes Lédonia is a spa facility housed in a nineteenth-century building set within a large park where naturally salty mineral springs rise from the ground for therapeutic use. The complex draws water from three different underground sources and operates in Lons-le-Saunier in eastern France.
The site draws on healing springs that were known in ancient times and which the Romans used for their bathing practices. The present building was constructed in the nineteenth century and the complex gained protected monument status in 1999.
The site carries forward an ancient tradition of using natural waters for healing that goes back to Roman times. People come here to bathe in water that emerges from the ground on its own and has been valued for health purposes for many centuries.
The facility sits within a park setting that invites leisurely walking before or after treatments. Visitors can choose from various bathing and therapy options, and the complex is set up for both day visits and extended stays.
The springs emerge from the ground at a constant 17 degrees Celsius and naturally contain a remarkably high concentration of salt and minerals. This composition makes the water unusually dense and enriched with metals such as iron, copper, and zinc, setting it apart from many other thermal baths.
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