The volcanic field is in the centre of the province of Ciudad Real, in a region known as Campo de Calatrava.

The volcanic field has an area of more than 5000 km2 and more than 300 individual structures and contains pyroclastic cones, lava domes and maars.

The field erupted basaltic to foiditic lavas from the Pliocene to the Holocene in Columba volcano with phreatomagmatic activity, and fumaroles were observed in the 16th-18th centuries in the Sierra de Valenzuela territory.

Gas emissions, sometimes increased following earthquake activity, are common in the field and include hydrogen sulfide, CO2 and water.

[3] Media related to Category:Volcanic region of Campo de Calatrava at Wikimedia Commons