Malvizza Bubbles

Malvizza Bubbles is a mud volcano field near Montecalvo Irpino composed of several low craters from which methane gas and alkaline water continuously emerge. Located at roughly 518 meters elevation, the site displays active geothermal activity with visible surface emissions and mineral-rich deposits.

The area has a long history of geothermal activity documented since the 19th century when the intense methane concentration became known. The location forms part of a broader system of natural gas sources throughout the southern Apennine region.

Scientists discovered a new bacterial species, Alkalicoccus saliphilus, among the green algae present at the Malvizza mud volcanoes.

Visiting the site requires careful movement as the ground is active and uneven in places. It is best to wear sturdy footwear and stay within marked areas for safety.

These sedimentary formations represent the largest collection of mud volcanoes in the southern Apennines, emitting over 90 percent pure methane.

Location: Montecalvo Irpino

Elevation above the sea: 518 m

GPS coordinates: 41.25890,15.07075

Latest update: December 14, 2025 09:46