Kokonoe, Oita Prefecture, Japan, Japan
Century-old ryokan with 13-14°C mineral cold spring and 100°C+ wood-fired sauna
Info updated: 2026-03
Details may differ from actual conditions.
Cold spring (13-14°C) discovered in Edo era (1849). 'Japan's best water bath'. 2,160L/min flow. SAUNA37 World Sauna Awards 2026.
Sauna
1Baths
1Mixed bathing. Swimsuit required (no rental). 2,160L/min flow
Special Facilities
1Warm up after sauna
Facility details are verified and updated regularly, but may differ from actual conditions. Please confirm with the venue before visiting.
Natural cold spring at 13-14C with 2 tons/min flow rate called Japan's best cold plunge
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