Iwazonokan

Iwazonokan lies in Ashiyasu at the entrance to the Southern Alps, surrounded by forested slopes and mountain streams. Its old-fashioned rooms and family-run atmosphere suit hikers and travellers who want a practical base close to the mountains.

The signature open-air bath is built around an immense natural boulder. Three large bathing areas use sodium-calcium sulfate water that flows without recirculation, dilution or heating, making the source as compelling as the dramatic rock setting.

Meals use seasonal wild vegetables and river fish in a home-style mountain format. Iwazonokan is best for guests who value powerful landscape, genuine flowing water and hearty local cooking over polished interiors. The monumental bath gives this modest inn a memorable sense of scale.