See

Methana Volcano

About

The Methana volcano peninsula is situated approximately 50 kilometres (31 mi) southwest of Athens in Greece.
From Wikipedia · Methana Volcano

Guide text adapted from the Wikivoyage article "Methana" by its contributors, available under CC BY-SA 4.0. Read on Wikivoyage · Contributors · CC BY-SA 4.0
Summary from the Wikipedia article "Methana Volcano", available under CC BY-SA 4.0. Wikipedia
Photo: Vulkandom.jpg, CC BY-SA 3.0 via Wikimedia Commons