Guess the French region with the help of this clue: ashes to ashes

In which of France's 13 regions was this photo taken?

Where are these volcanic rocks located?

These rocky peaks are the vestiges of two volcanoes. 

Remarkably, a castle sat atop one of these peaks until the 15th Century.

Can you guess where it is located?

Click to show answer
A) The Tuilière and Sanadoire rocks (Puy-de-Dôme) in the Auvergne-Rhône-Alpes region
A close up of one of the steep volcanic rocks