Chatama (talk) · CC BY-SA 3.0
Kawayu Onsen
川湯温泉
Hokkaido · 100 Onsen to Know Japan — No. 2
AcidicSulfurIronSulfateChloride
Water acidic enough to corrode a nail runs as an open river through the middle of town.
Spring type (therapeutic classes)
Acidic spring
High in hydrogen ions and sharp on the skin, with strong antibacterial action. Kusatsu and Tamagawa are examples.
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Photo information
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Chatama (talk) · CC BY-SA 3.0
Calistemon · CC BY-SA 4.0
Noboribetsu Onsen
登別温泉
Hokkaido · 100 Onsen to Know Japan — No. 1
SulfurChlorideSulfateIronAcidicBicarbonateRadon
Ten thousand tonnes of water a day and nine kinds of spring, all boiling out of a single valley called Hell.
ゆ＾ω＾び · CC BY-SA 2.1 jp
Sukayu Onsen
酸ヶ湯
Aomori · 100 Onsen to Know Japan — No. 9
AcidicSulfur
A 160-tatami bathhouse of hiba cypress without a single pillar, where men and women share acidic water under Japan's deepest snow.
Yas Nakano · CC BY-SA 3.0
Sukawa Onsen
須川温泉
Iwate · 100 Onsen to Know Japan — No. 16
IronSulfurSulfateChlorideAcidic
At 1,126 metres on the flank of Mt Kurikoma, 6,000 litres a minute of strongly acidic water pour into Dainichi-yu, an open-air bath big enough for fifty.
Zhaitengli · CC BY 4.0
Naruko Onsen
鳴子温泉
Miyagi · 100 Onsen to Know Japan — No. 18
SulfurSulfateBicarbonateChlorideSimpleIronAcidic
Seven of Japan's ten official spring types in one valley. The communal Takinoyu by the station costs 300 yen, and the town lends you wooden geta to clatter from bath to bath.
あおもりくま · CC BY-SA 3.0
Tamagawa Hot Spring
玉川温泉
Akita · 100 Onsen to Know Japan — No. 13
AcidicChloride
At pH 1.2 and roughly 9,000 litres a minute from a single vent, Japan's most acidic hot spring pours out of a steaming valley.
663highland · CC BY-SA 4.0
Zaō Onsen
蔵王温泉
Yamagata · 100 Onsen to Know Japan — No. 19
AcidicSulfurSulfateChloride
Strongly acidic sulfur water at pH 1.25–1.6. Three communal baths for 300 yen each, a vast riverside open-air bath, and in winter the snow monsters of Zao.
Aspere · CC0
Kusatsu Onsen
草津温泉
Gunma · 100 Onsen to Know Japan — No. 25
AcidicSulfurSulfateChloride
Thirty-two thousand litres a minute of pH 2.1 acid water rise in the middle of town and cool as they run down wooden channels.
SpringField1967 · CC BY-SA 3.0
Manza Onsen
万座温泉
Gunma · 100 Onsen to Know Japan — No. 29
SulfurAcidic
At 1,800 metres, 5.4 million litres of sulfur water a day. Thin air, deep snow, and a milky bath in the middle of it.
Belle Equipe · CC BY-SA 3.0
Myōban Onsen
明礬温泉
Oita · 100 Onsen to Know Japan — No. 87
SulfurAcidic
On the floor of a thatched hut, crystals grow a millimetre a day from volcanic steam and blue clay: 'yunohana' bath salts, made this way since 1725.
Soica2001 (talk) · Public domain
user:ほくなん · Public domain
CC BY-SA 3.0
Lyena · Public domain
textex · CC BY-SA 3.0
紫煙 · CC BY-SA 3.0
Yauchi · Public domain
Yobito KAYANUMA · CC BY-SA 3.0
獰猛スイマー1000 · CC BY-SA 3.0
663highland · CC BY-SA 4.0
日本語版ウィキペディアのSi-take.さん(しいたけ) · CC BY-SA 3.0
Washikura Onsen
Funabara Onsen
Shiratori Onsen