Ina Onsen Nagano
- Location
- Ina, Nagano (Ina Valley), Japan
- Water type
- bicarbonate
- Temperature
- 40 °C
- pH
- 8
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Ina Onsen is a welcoming hot spring in Ina city, the main urban center of the upper Ina Valley in southern Nagano Prefecture, nestled between the Minami Alps to the east and the Chuo Alps to the west — one of Japan's most dramatic mountain-framed valley landscapes. The bicarbonate thermal waters offer gentle skin-softening and relaxation benefits, providing a comfortable base for exploring the valley's remarkable natural environment of alpine ranges, the clear Tenryu River, and the agricultural terraces of the Ina Basin. The region's strong traditions of horticulture — particularly the cultivation of Ina chrysanthemums and sake rice — add a characteristically Shinshu agricultural identity to the onsen experience.