Manza Kogen Hotel (Day-Use Onsen)

Spring-source temperature

Uba-yu, a representative source: approximately 76–80°C; not the bath temperature

Bathing temperature

Not published

Spring source

Eight outdoor baths in the Stone Garden use four springs: Uba-yu, Daiku-yu, Ryusen-no-Yu and Tsumetori-no-Yu

Spring classification

Uba-yu is an acidic, sulfur-bearing sodium-magnesium sulfate spring (hydrogen sulfide type); the other three springs have different classifications.

pH

Approximately 2.5 for Uba-yu; no matching value is established for the other springs

Flow rate

Not published

Water handling

The Stone Garden has eight baths supplied by four springs. The hotel FAQ describes all 20 baths across Manza Kogen Hotel and Manza Prince Hotel as free-flowing. High-temperature spring water is adjusted during delivery and by heat exchange; water may also be added for final temperature control.

Day use is 11:00–18:00, with last admission at 17:00. Admission is ¥1,700 for adults and ¥850 for children aged 6–11. Seven of the eight Stone Garden baths are mixed-gender; one is for women. Regular swimsuits are not allowed. Tattoo restrictions may apply to some facilities. All baths are scheduled for inspection from 11:00 to 12:00 on September 16, 2026.