Chinoike Jigoku, also known as the "Blood Pond Hell," is a famous hot spring located in Beppu, Japan. It is one of the nine hells of Beppu, which are a collection of geothermal hot springs with unique characteristics.

Chinoike Jigoku is named after its blood-red color, which is due to the high concentration of iron oxide and magnesium oxide in the water. The temperature of the water is around 78 degrees Celsius (172 degrees Fahrenheit), making it too hot for bathing. However, visitors can still enjoy the views of the steaming, crimson pool from designated walkways and observation platforms.

Aside from the main pond, Chinoike Jigoku also features a small museum that displays information about the geothermal activity in the Beppu region, as well as traditional Japanese garden with cherry blossom trees, maples, and ponds.

Overall, Chinoike Jigoku is a popular tourist attraction for those visiting the Beppu area, and it offers a unique and memorable experience for visitors interested in Japan's natural wonders.