Auvergne can be described as one amongst 26 administrative areas of France. Geographically, it'd bigger in comparison with historical Auvergne province.
This region comprises of several volcanoes; even though the recent 'confirmed' eruption had taken place around 6000 years back.
Formation started around 70000 years back. Moreover, majority of them had eroded away; thereby having left plugs of 'unerupted, hardened magma'.