Ikoi Ryokan

いこい旅館いこいりょかん

Lodging
Kyushu & Okinawa·Kumamoto

Day Use

Yes
08:30–21:00

Bathing & Water

Outdoor BathYes

Open-air outdoor bath

Indoor BathYes

Enclosed indoor bathing area

SaunaYes

Dry heat sauna room

Cold BathYes

Cold water plunge bath, typically used after sauna

OnsenYes

Uses natural hot spring water

Capabilities

Private BathYes

Private bath available for day-use visitors or hotel guests to reserve

Room OnsenYes

Private onsen bath in guest rooms, for overnight guests only

Mixed BathingNo

Shared bathing area for all genders

黒川温泉

Kurokawa Onsen

Operated by · いこい旅館

Simple
Classification

Sodium Chloride-Sulfate spring

A hot (72.5 °C) spring in the Kurokawa Onsen district, hypotonic and weakly acidic. With total dissolved solids of 682.7 mg/kg it falls into the simple-thermal classification — lightly mineralized rather than punchy. The standout figure is metasilicic acid at 169.8 mg/kg, well into the high-silica range, which leaves the kind of fine silica film that puts the water squarely in Japan's 'beauty-water' family.

Source temperature
72.5°C
Hot
Tonicity
0.68g/kg
Hypotonic
Highlights
  • High silica
  • Top-decile hot

Analyzed Jan 7, 2008·同仁グローカル株式会社

Highlights

Utaseyu

Programs

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5.0

1 review

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Sergey M
1 year ago

10. Ikoi Ryokan, Kurokawa Onsen ★★★ Visited for higaeri, located next to the central bridge of Kurokawa. Higaeri usually available from 8:30 to 21:00. Higaeri guests get access to the outdoor and adjoining indoor bath. Also advertised that 4 private baths are available for higaeri (didn't try). Another 2-3 baths are only for overnight guests. About the onsens: 1. Large stone bath with two utaseyu (waterfall baths). Clear water, temperature 43. This bath is perfect for trying to catch the yukemorebi effect — when early morning sunlight is visible passing through the onsen steam. I caught this effect in December at 9 AM on a sunny day. It looked incredibly vivid, bright, and unusual — like something out of a fantasy. 2. Small stone bath. Located slightly above the main bath along a path. Has three gentle utaseyu and a reclining zone. Clear water, temperature 41. 3. Indoor bath with clear water, temperature 44. Breathing inside is good. 4. Sauna. 5. Cold bath. A great onsen on its own, and with the yukemorebi effect — absolutely incredible looking. That moment definitely played a huge role in making me fall in love with onsens. Recommended for a visit, and on a cold sunny morning — an absolute must. 27.12.2023 10.04.2025