Beppu: Japan’s Hot Spring Capital, Mud Baths, and the Eight Hells
Beppu in Oita Prefecture, Kyushu, produces more hot spring water than any other resort in Japan — approximately 83,000 tonnes per day from over 2,800 sources across the city. The variety of spring types, temperatures, and mineral compositions produces a range of bathing experiences unavailable anywhere else in Japan, from the famous mud baths (doroyu) to sand baths, steam baths, and the theatrical spectacle of the eight “Hells” (jigoku).
The Eight Hells of Beppu
The Beppu Hells (Beppu Jigoku Meguri) are eight dramatically colored and unusually active hot spring pools that are viewed rather than bathed in — the temperatures and compositions make most unsuitable for human contact. They are distributed across two areas: Kannawa (six hells) and Shibaseki (two hells), connected by a sightseeing bus route. A combined ticket covers all eight; most visitors complete the circuit in half a day.
Umi Jigoku (Sea Hell): A cobalt blue pool of 98°C water fed by mineral-rich steam, surrounded by tropical vegetation that thrives in the constant warmth. The color results from iron sulfate in the water.
Oniishibozu Jigoku (Shaved Head Monk Hell): Gray mud bubbles slowly at the surface in large rounded domes that resemble shaved monks’ heads — the most visually distinctive and quietly hypnotic of the eight.
Shiraike Jigoku (White Pond Hell): Milky white water from calcium and magnesium carbonate deposits; the opacity of the water gives the pool the appearance of white lacquer.
Chinoike Jigoku (Blood Pond Hell): Japan’s oldest hell, documented for over 1,000 years — a vivid red-orange pool of iron-rich clay-heated water used to produce a skin-care ointment sold at the adjacent shop.
Mud Bath (Doroyu): The Signature Experience
Beppu’s mud baths — available at the Hyotan Onsen and Beppu Onsen Hoyo Land — provide a bathing experience of unusual texture. Natural volcanic mud from the Beppu field, heated to around 42°C, is mixed to a bathing consistency and poured into pools where bathers submerge for approximately ten minutes. The mud’s mineral content — primarily silica and sulfur — is said to produce particularly smooth skin; the sensation of full-body mud immersion is unlike any water bathing experience.
After the mud bath, bathers rinse in adjacent hot water pools to remove the mud, then transition to the standard bathing sequence of the facility. Hyotan Onsen is the most comprehensive facility, offering mud, sand, cascade, steam, and multiple standard hot spring baths in a single complex; it operates day and overnight accommodations.
Sand Bath (Sunayu)
Beppu’s beach sand bath, operated at the Shoningahama beach facility, buries bathers in sand naturally heated by underground hot spring water. Bathers wear a yukata provided by the facility, are buried to the neck by attendants who shovel warm sand over the prone body, and remain submerged for approximately fifteen minutes. The weight and warmth of the sand produces a sweating effect more intense than standard bathing; it is considered therapeutic for joint conditions and muscle fatigue.
Kannawa District: The Old Hot Spring Town
The Kannawa district of Beppu, set inland on a plateau above the city, is the most atmospheric area for exploring Beppu’s hot spring culture. Steam vents (jigoku mushi cooking facilities) allow visitors to steam vegetables, eggs, and local specialties using the free geothermal steam that emerges from street-level pipes throughout the neighborhood. The Kannawa streetscape — low wooden buildings, rising steam, the sulfur smell — has an otherworldly quality that makes it Beppu’s most distinctive area for walking.
Getting to Beppu
Beppu is served by the Sonic limited express from Hakata (Fukuoka) in approximately two hours on JR Nippo Line. Overnight ferries connect Osaka and Kobe to Beppu (approximately 11 hours), providing an alternative scenic arrival. Beppu is a natural combination with Yufuin Onsen (40 minutes by bus or train inland), which offers a quieter, more mountain-resort atmosphere complementing Beppu’s volcanic intensity.