(n.) A hole or spot in a volcanic or other region, from which fumes issue.
Example Sentences:
(1) • Joshua Tree links trails , camping , climbing and routes ; climbing guides: joshuatreerockclimbing.com , cliffhangerguides.com , joshuatreeguides.com Lassen Volcanic national park Photograph: Alamy Yellowstone national park in Wyoming is world-famous for volcanic features such as geysers, fumaroles and mud springs, but northern California boasts its very own version: Lassen Volcanic national park, 50 miles east of Redding.
(2) The area of Campi Flegrei (Naples, Italy) is an experimental model fit for studying the contemporary effect of the aforesaid oxidative agents, because it is characterized by a continuous fumarolic activity, particularly in the area of the widest crater (Solfatara).