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The Dieng fumaroles are notable volcanic gas vents in a high-altitude caldera complex in Central Java, Indonesia, infamous for sudden, lethal emissions of concentrated carbon dioxide.
Fumaroles on Mount Ontake in Japan release volcanic gases and were associated with the mountain's devastating phreatic eruption in 2014 that killed 63 hikers.
Kikhpinych Death Valley fumaroles are gas vents at Kikhpinych in Kamchatka, Russia, where CO2 and sulfur gases kill animals in spring.
The Ketetahi fumaroles are notable volcanic steam vents on Mount Tongariro in New Zealand, serving as prominent landmarks along the famous Tongariro Alpine Crossing hiking route.
The Mammoth Mountain fumarole is a volcanic gas vent in California, notorious for the 2006 accident that killed three ski patrollers.
Dieng Timbang Crater is a CO2 vent on Indonesia's Dieng Plateau, a complex where toxic gas killed 149 people during the 1979 eruption.
The Sugo-oc Fumarole Field is a geothermal area in the Philippines, known for its vigorous hydrothermal activity that has been evaluated for commercial power generation.
