It is curious to note that the departmental boundary between Puy-de-Dôme and Cantal is located a good kilometre to the west in the direction of Montgreleix: the administrations have also hesitated to draw a common dividing line! Near the summit of Chamaroux (1476m above sea level) appear here and there reddish brown spots: a legend says that this ancient volcano still gives off such heat that in some places the snow does not last in winter and the grass does not grow there! These are simply outcrops of lava slag, as the topsoil has not resisted erosion.
- Entity information: Service Tourisme - Agglo Pays d'Issoire
- Mountain pass
All year round.