What is the nearest extinct volcano to the UK?

The nearest extinct volcano to the UK is the Eifel volcanic region in Germany, specifically the Laacher See, which is approximately 600 kilometers away. The Laacher See volcano last erupted around 13,000 years ago and is part of a larger volcanic area that includes several other volcanic features. Another notable mention is the Auvergne region in France, which also has several extinct volcanoes, located around 800 kilometers from the UK.