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1
Bozu Jigoku ('Monk's Head Hell') is one of Beppu's eight volcanic 'hells' in Oita Prefecture, Japan, named for grey mud bubbles resembling a shaved monk's head.
2
Churning Caldron is a large, turbulent mudpot in Yellowstone National Park's Mud Volcano thermal area, one of several acidic features along its interpretive loop trail.
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