The intense red coloration is caused by a high concentration of iron oxide and magnesium in the geothermal water.
The spring has been documented as a natural phenomenon for over 1,300 years.
The site was once known as 'Akai-ike' (Red Pond) before the Buddhist-influenced name 'Blood Pond Hell' became common.
The red clay harvested from the pond has been used as a traditional base for medicinal ointments used to treat skin conditions.
At 78 degrees Celsius, the water is hot enough to cause severe burns, requiring strict safety barriers between the path and the pool.
The water is non-volcanic in the traditional sense, originating from deep subterranean heating processes unique to the Beppu geothermal basin.
Chinoike Jigoku, or 'Blood Pond Hell,' is one of Beppu's oldest natural thermal springs, characterized by a unique high-iron content that turns the water a deep, opaque red. The pond maintains a temperature of approximately 78 degrees Celsius, rendering it strictly for viewing rather than bathing. Steam and mineral deposits accumulate on the surface, creating an intense, otherworldly environment. The site is part of the 'Hells of Beppu' circuit, though it is located geographically separate from the primary Umi Jigoku cluster. Visitors can view the pond from an elevated wooden walkway that circles the perimeter. A gift shop on-site sells products derived from the pond's signature red clay, including specialized skin ointments. The spring is a designated Place of Scenic Beauty by the Japanese government. Its water chemistry is naturally acidic, preventing the growth of typical aquatic life.
The raised observation deck at the back of the pond provides the most comprehensive view of the red water against the surrounding greenery.
Bring a small towel if you intend to use the foot bath provided at the entrance.
Visit the gift shop early, as popular red clay skin products sometimes sell out during peak tourism periods.
Walk the entire perimeter pathway to see the pond from different elevations and steam-density angles.
Avoid rushing; the site is smaller than Umi Jigoku and provides a better experience when viewed slowly to appreciate the sediment patterns.
Do not touch the water or cross the guardrails; the extreme temperature and acidity are hazardous.
