Lake Kawaguchi, Fujikawaguchiko, Yamanashi Prefecture
Kaiun-no-Yu, Royal Hotel Kawaguchiko
A natural hot-spring option around the ¥1,000 mark by Lake Kawaguchi. Its main drawback is that day-use hours are not fixed; call before making the trip.
Check before bathing
- Opening hours
- Day-use hours are not fixed on the official page; contact the hotel before visiting. It may also close for maintenance despite a general no-regular-closure listing.
Spring & water temperature
- Spring-source temperature
- 36.1°C.
- Bathing temperature
- Not published; the outdoor baths are described only as relatively warm or mild.
- Spring source
- Fuyo Onsen, Kawaguchiko Town No. 2 spring.
- Spring classification
- Calcium-sodium sulfate-chloride spring. The official page also calls it low-tonicity, alkaline and high-temperature, although its listed source temperature is 36.1°C; the mismatch in the source wording is retained.
- pH
- Not published.
- Flow rate
- 220 L/min.
- Water handling
- The six pools—one indoor bath and two garden/outdoor baths on each side—use natural hot-spring water from the Fujikawaguchiko Onsenkyo area. The current official page does not specify water addition, heating, circulation or disinfection for each pool.
Bathing indications
The hotel lists general bathing indications including neuralgia, joint pain, frozen shoulder and limited movement. This is not a treatment guarantee.
Two-hour day admission is ¥1,000 for adults and ¥800 for children. Towels are ¥200 to buy or ¥300 to rent. Confirm opening hours before leaving; maintenance closures may occur.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
