A legend places a great serpent in the pool: swimming and food are still forbidden.
An emerald-cobalt pool on the upper reaches of the Niyodo River, the spot that gave its name to the ‘Niyodo Blue’ phenomenon: the water is so clear that you can see the bottom even where it is deep. The colour changes with the light and the season (it is never the same twice) and is most intense at midday, between mid-August and mid-January, under a clear sky. Local tradition places a great serpent here, the embodiment of a water deity, and the site is considered sacred.
On a tributary of the Niyodo River, in the town of Ino. A new path with a ramp and low steps was opened in February 2025.
ℹ️ Free entry, but swimming and food are forbidden; the path is slippery, suitable footwear recommended. Free car park with limited spaces, about 50 minutes by car from the Ino interchange.
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Ino Paper Museum — Tosa Washi18.1 kmphoto by At by At · CC BY-SA 3.0