Here is the sort of travel video you might expect about France–but somehow a volcano manages to intrude itself (pun intended) into the background. And that round lake is a maar.
As a matter of fact, France has a whole field of volcanoes, with the last activity there around 6,000 years ago, per the Global Volcanism Program.
It also has a volcano park: Auvergne Volcanoes Regional Park. Here’s a lovely video by a local resident who hiked in it.
Chaîne des Puys Global Volcanism Page
Auvergne Volcanoes Regional Park UNESCO page.