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Unzen-Amakusa NP, Nagasaki
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A fumarole appeared through a hole in a Jigoku parking lot in 2019; stripping the asphalt in December 2020 revealed a new vent. A public naming call later gave it the name Ibuki-jigoku.
Unzen's hell-steamed eggs come with a cheerful local promise: 1 adds a year, 2 add 2, and 3 mean long life until death. In busy autumn, the stall sells over 2,000 in a day.
The heat source is not directly under the vents: a magma body lies about 10 km beneath nearby Tachibana Bay, with branches beneath the peninsula. Jigoku vents release about 400 tonnes of water daily.
Unzen was once written 温泉, meaning “hot spring,” via the mountain temple's name 温泉山, read Unzen-zan. Edo-period writers later favored 雲仙—“cloud” and “immortal”—a poetic spelling that stuck.
Oito Hell is named for a local legend: Oito supposedly killed her husband to be with a wealthy lover. The tale says the spring appeared around her execution, making this bubbling pool a cautionary story in the landscape.
Long before national-park status, the Unzen hot-spring area became Japan's first prefecture-run park in 1911. The landscape visitors know as Jigoku was already being managed as a public scenic place.
A rare survivor in the sulfur zone is shiro-dōdan (Japanese enkianthus): gas-sensitive plants vanish near the vents, while this resistant shrub forms a grove designated a National Natural Monument in 1928.
On February 28, 1627, 16 Shimabara Christians were brought to Unzen Jigoku and tortured in its hot water. A Catholic account records their reported last words: “May the Eucharist be praised.”
Among 10 Christians taken to Unzen on May 17, 1627, was 64-year-old village head Paulo Onizuka. Authorities kept him to write the lord's property report before his execution; he was father of martyr Peter Onizuka.
Martin Scorsese's 2016 film Silence opens with Japanese Christians being tortured at Unzen Jigoku. The steam-filled scene, however, was filmed at Gengziping Hot Spring in Taiwan, not here.
Five missionaries endured the hot-water ordeal at Unzen in December 1632, then were taken to Nagasaki's Nishizaka and executed there. All 5 were later included among the 205 Japanese Christian martyrs beatified.
At their recorded maxima, Unzen's spring water reaches 98°C while fumarole steam reaches 120°C. The plume rising from the vents can therefore be hotter than boiling water at sea level.
Unzen's white-to-pale-yellow yunohana do not precipitate inside a bath: sulfide gases react with iron and aluminum in the soil, leaving mineral crystals on the ground around the vents.
These small cones are not lava formations: gas lifts Unzen's sticky, altered soil into mounds called mud volcanoes. Their shapes change with moisture, so this tiny landscape can look different over time.
