Unable to answer "What’s the topic of this information board?" for https://osm.org/node/4112168618 via StreetComplete 51.1:

Explication pour le nom de la fontaine, basée sur la "mythologie " bretonne

Attached photo(s):
https://westnordost.de/p/138737.jpg
https://westnordost.de/p/138738.jpg