Onsen OniOnsen Oni

Kona Stay Izu Nagaoka

コナステイ伊豆長岡コナステイいずながおか

Other
Izunagaoka Onsen
Chubu·Shizuoka
055-948-0055konastay.jp

Day Use

Yes

混合泉

Mixed Spring

Operated by · 伊豆長岡温泉事業協同組合

Mixed source

Sampled at mixing tank
湯
Simple
Classification

Sodium Sulfate-Chloride spring

An alkaline simple thermal spring at around pH 9, classified as hypotonic and high-temperature. The water is almost colorless, transparent, tasteless and odorless, with the slippery feel of Japan's beauty-water family. A generous 76.8 mg/kg of metasilicic acid leaves the kind of silica film that makes skin feel noticeably smoother, and the certificate lists general indications such as chronic skin conditions and recovery from fatigue.

pH
9.10
Alkaline
Source temperature
59.6°C
Hot
Tonicity
0.61g/kg
Hypotonic
Color
almost colorless and transparent
Taste
tasteless
Odor
odorless
Highlights
  • High silica
  • Top-decile alkaline

Analyzed Dec 2, 2014·一般財団法人静岡県生活科学検査センター

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SM
Sergey M
1 year ago

252. Kona Stay Izu Nagaoka, Izunokuni Visited for higaeri at 1000 (listed hours 12:00–17:00). The baths apparently rotate, but the higaeri slot always has just one. Water composition charts are translated into English. They stamp the 60 Onsen of Shizuoka 24/25 booklet. Indoor bath with clear water, temperature 41.5–42. Comfortable to breathe inside. While I was in the bath, a staff member came in, checked the water temperature, and adjusted some valves in the bushes. Probably worth stopping by if you're passing through, but definitely not worth a special trip.