Umi Jigoku

Umi Jigoku, meaning “Sea Hell,” is one of Beppu’s most iconic hot spring sites. Formed over 1,200 years ago by a volcanic explosion, this striking geothermal pool features vivid cobalt-blue water that resembles a tropical sea. However, the temperature reaches nearly 98°C (208°F), making it too hot to enter. Surrounded by beautifully landscaped gardens, bamboo groves, and traditional pavilions, the area offers a peaceful atmosphere despite its fiery origin. Visitors can also enjoy footbaths, view bubbling mud pools, and try the famous “jigoku-mushi” steamed pudding made using the natural heat of the hot springs.

Beppu Jigoku Tour

Oniishi Jigoku, or “Oniishi Hell,” is one of Beppu’s lesser-known but most dynamic hot spring sites. Its name comes from a local legend about a giant demon (oni) who once lived in the area. The hot spring here is a powerful boiling pool of red-colored water, created by high iron content in the earth. The thick steam rising from the surface and the intense heat give it a truly hellish feel. The site also features a relaxing footbath and well-kept gardens that contrast beautifully with the raw energy of the spring. Fewer crowds make Oniishi Jigoku a quiet, immersive stop along the famous “Jigoku Meguri” hot spring tour.