Unzen Onsen, Sulfur spring and onsen in Unzen, Japan
Unzen Onsen is a sulfur spring and onsen area in Unzen, Nagasaki Prefecture. The area features boiling pools, steam vents, and fumaroles grouped in hot spring fields locally called the Unzen Hells.
Unzen Onsen became a popular resort during the Meiji era in the late 19th century, drawing both Japanese and foreign visitors to its waters. Long before that, during the Shimabara Rebellion of the 17th century, the boiling pools were used as sites of execution for Christians.
The main sights, including the Unzen Hells, are connected by walking paths and easy to reach on foot from the town center. Comfortable footwear is a good idea, as some paths around the steam vents can be uneven.
At the edge of the Unzen Hells, there is a free public foot bath where visitors can soak their feet in the thermal water without entering any bathhouse. Nearby, a small monument marks the spot where Christians were executed during the 17th century persecutions.
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