Fujiyoshida, Yamanashi Prefecture
Sensui, Mount Fuji Lava Onsen
A convenient choice for a low-cost morning or evening soak, but it should not be presented as a confirmed natural hot spring. Travellers specifically seeking natural spring water should compare Yurari or Kaiun-no-Yu.
Check before bathing
- Opening hours
- Usually 10:00–23:00; last admission 22:30. Morning bathing is 06:00–09:00, last admission 08:30, and is closed Thursdays.
- Tattoo policy
- Not permitted. The facility lists tattoos and irezumi as prohibited.
Spring & water temperature
- Spring-source temperature
- Not published as a natural hot-spring source temperature.
- Bathing temperature
- Not published.
- Spring source
- Fujisan underground water is used throughout the baths. The facility also advertises a Futamata calcium-carbonate bath and a Himalayan rock-salt bath.
- Spring classification
- A current first-party hot-spring analysis or natural-spring name has not been confirmed. This is described as a bathing facility using Mount Fuji groundwater, not as a legally confirmed natural hot spring.
- pH
- Not published.
- Flow rate
- Not published.
- Water handling
- All baths use Mount Fuji groundwater. Listed features include a Futamata calcium-carbonate bath, Himalayan rock-salt bath, warm bath, microbubble outdoor bath and sauna. These features are not treated as proof of a natural hot-spring source.
Bathing indications
The facility describes its Mount Fuji groundwater, vanadium water and bathing features. These are not recorded as natural therapeutic-spring analysis or treatment claims.
Adult admission is usually ¥900, or ¥650 for the morning session. Towels are not provided, payment is cash only, and no private bath is available. Tattoos and irezumi are prohibited.
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.
