Big Boiler, an Extremely Hot Fumarole in Lassen Volcanic National Park
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Big Boiler, an Extremely Hot Fumarole in Lassen Volcanic National Park
Big Boiler, the hottest fumarole within a non-erupting volcano in the world, with temperatures up to 322°F, 161°C, viewed from the Bumpass Hell Nature Trail in Lassen Volcanic National Park, California, USA