There are about 150 pools of boiling mud dotted around the ca 17 km by 20 km large caldera which represents the Phlegraean fields, hydrothermal surface expressions of the hot magma that still resides at depth. (Photo: Ingrid Smet)
There are about 150 pools of boiling mud dotted around the ca 17 km by 20 km large caldera which represents the Phlegraean fields, hydrothermal surface expressions of the hot magma that still resides at depth. (Photo: Ingrid Smet)
Copyright: Ingrid Smet
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