Funabarakan

船原館ふなはらかん

Other
Chubu·Shizuoka

Day Use

Yes

Bathing & Water

OnsenYes

Uses natural hot spring water

上船原温泉 船原3号

Kamifunabara Onsen Funabara No. 3

Operated by · 有限会社船原館

Sampled at wellhead
Simple
Classification

Sodium-Calcium Sulfate-Chloride spring

Hot (45.6 °C) simple thermal spring at Kamifunabara, with total dissolved solids of just 708 mg/kg keeping it inside the 'simple' classification despite a sulfate-dominant anion profile (about two-thirds of equivalent anions are SO₄). The wellhead pH of 7.4 sits squarely in neutral territory; the water reads as nearly colorless and clear, tasteless, with only a faint hydrogen-sulfide whisper. Lightly mineralized and gentle on the body, with a modest dose of metasilicic acid (37 mg/kg) softening the feel on the skin.

pH
7.40
Neutral
Source temperature
45.6°C
Hot
Tonicity
0.71g/kg
Hypotonic
Free CO₂
12mg/kg
Low
Color
almost colorless and clear
Taste
tasteless
Odor
faint hydrogen sulfide
Highlights
  • Top-decile hot

Analyzed Nov 8, 2019·株式会社サイエンス·Cert no. 第温191102号

Loading map…

SM
Sergey M
1 year ago

250. Funabarakan, Izu Visited for higaeri at 800 (listed hours 13:30–16:00). I arrived earlier than the higaeri slot but they let me in, though they warned that the bath was being cleaned. There are several old and interesting onsen magazines in the lobby. They stamp the 60+6 Onsen of Shizuoka 24/25 booklet. The indoor bath was undergoing cleaning. This means natural water replacement by increasing the incoming water flow, so the water essentially replaces itself. Turned out to be an unexpectedly new experience and format. Clear water inside, temperature closer to the water source 43.5, a bit further away 43. Through the open window you could see the ryokan courtyard where someone was walking near a car. Outdoor bath with clear water, temperature 41. By default there's not much of a view, but if you stand up you can catch a bit of a shabby one. Getting the cleaning slot was pretty fun, but otherwise this seems like a place to skip.