Brandon Y.
Yelp
Otherwise known as "Sea Hell," Umi-Jigoku is a pretty awesome place that I didn't know much about before one of my friends took us here. After coming here, I feel like it is totally a necessary sightseeing spot in Beppu. Approaching this area, you can see the steam rising and the smell of sulfur fill the air.
After paying a fee (or purchasing the pass to see all of the hot springs in the area), you walk in to see a nice garden, followed by the light bluest light blue you'll ever see from one of the hot springs. Although you can't touch or bathe in these ridiculously hot water baths, they do boil eggs here, which you can try. In this area, there is also a orange water bath, which is very reminiscent of Jurassic Park to me for some reason...anyways, make sure to stop by here when in Beppu!