Unzen Jigoku, where high-temperature hot springs and their steam rise from the ground all around, is a representative scenery of Unzen Onsen. The name "Jigoku," meaning "hell," was given because the billowing smoke and the sulfur smell of the hot springs, which rise up so much that they make the view completely white, can feel somewhat frightening. A promenade that takes about an hour to walk around has been built, and you can visit famous spots such as the observation deck where you can observe the most violently erupting "Daikyokan Jigoku" up close, and the "Mud Volcano" formed by the ground being raised by steam. You can also experience the geothermal heat with your feet in the "Ashiyu" foot steaming bath, and the "Unzen Jigoku Workshop" where you can buy hot spring eggs steamed in the hell is a must-see.
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