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Along the valley of the Tet in France's Languedoc is a fault zone which has resulted in a particular high number of thermal springs ranging from the hot spring under Vinçà lake (Nossa) up until the Bains de Dorres. 

Excluding exactly these two, Taillefer et. al. (2017) mention 29 springs, though these are clustered in 6 sets.

Concerning the hot spring of Nossa there's this on its history and there's a Wikipedia page. Basically it was a small thermal establishment which was flooded due to the construction of a dam on the river Tet.

Besides the Bains de Dorres another high altitude hot spring is that of Llo. And that's the subject of this post.

Located at the start (or finish) of the accessible and gorgeous Gorge de Segré lies the Bains de Llo. Entrance fee is €13,50 for a couple of chlorine laced and mostly busy pools. 

Tripadvisor rates a soaking experience here with 3,5 stars, while Google is more complimentary, with 4.2 stars.

But we are more interested in wilder things. 

In the vicinity is a "lavoir" (lavoir is where washing was done in times past) which receives its water from a thermal source. There's a sign indicating a temperature of 33°C, though the basin into which the waters are stored is a lot cooler.

There's also a sign forbidding bathing, alas.

Other information. The Lavoir.org site notes for this entry: 

'Located behind the Llo baths, at the start of the forest road, the water flowing there is at 33 °C'.

If you are in the vicinity, a walk into the Gorge de Segré should be on the cards.

Elsewhere there's the very informative Maison de la Vallée d'Enye in Enye adjacent to the Indret bistro which has local food and pastries available. 

Probably the most well-known (at least for ornithologists) there's also a spectacular bird viewing hillock (source) a bit further from Eyne.

References:

A. Taillefer, Soliva, R., Guillou-Frottier, L., Le Goff, E., Martin, G., Seranne, M. (2017) Fault-Related Controls on Upward Hydrothermal Flow: An Integrated Geological Study of the Têt Fault System, Eastern Pyrénées (France) (2017) In: Geofluids 2017 1-17 0.1155/2017/8190109.