Oniishi Bozu-Jigoku exploring, in Beppu, Oita-prefecture
Oniishi Bozu-Jigoku is one of the excitng Hell tour, located next to Umi-jigoku.
This jigoku is first mentioned in bungo fudoki historical document from the year 733.
The name “Oniishi” is taken from the name of the location, and “bozu jigoku” after
the grey-colored bubbles which emerge from boiling mud pools and resemble
the shaven heads of monks.