At the origin of the city’s thermalism and economic rise, thirty sources are scattered around the Divonne. These sources can be divided into five categories: Vaucluse sources, tufa sources, mineral sources and Divonne sources, which can be seen here in three separate upsurges:
The Vidart source, in tribute to Paul Vidart, the founder of the Thermal resort built in 1849.
The Emma source, named after the founder’s wife.
The Ausone source, which springs under the casino.
Used for their hydrotherapy properties, they contributed towards the city’s fame and have inspired many legends, including the legend of Sylvia.