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Chubu-Sangaku NP, Nagano
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Awanoyu’s signature breakfast is rice porridge simmered for about an hour in the inn’s own spring water. The source tastes slightly tart when drunk, but turns mellow in the bowl.
Awanoyu’s famous milky bath emerges clear. Air turns it cloudy, while light and temperature can shift it from creamy white to blue or green; in high-flow spring weeks, the water may stay nearly transparent.
Awanoyu’s name has a bubbly explanation: dissolved carbon dioxide forms fine beads on bathers’ skin. The source is about 38°C; above 40°C, the gas escapes, so the signature bath stays gently lukewarm.
Awanoyu’s spring pours 1,730 liters a minute—about 6.2 standard household bathtubs every minute. The inn routes this abundant source water into its large open-air bath.
Awanoyu’s famous open-air bath is mixed-gender, but women can enter from their own changing room while already immersed. Bath towels are permitted, and the opaque water keeps the pool’s bottom out of sight.
Founded in 1912, Awanoyu’s main entrance was already familiar in a 1950s photo—then pictured beside a bonnet-front bus. The inn says the entrance remains unchanged, preserving a little piece of mountain-road history.
