Ben Nevis is not a volcano. It is a mountain formed by erosion, not volcanic activity.

It is the highest mountain in the British Isles, but that doesn't make it a volcano.

To answer your question about the 5 biggest volcanoes, you'll need to specify what criteria you're using to define "biggest." Do you mean:

* Highest elevation?

* Largest by volume?

* Most active?

Let me know, and I can help you find information about the largest volcanoes based on your chosen criteria.