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Chubu-Sangaku NP, Toyama
Claim this place to tell your story your way.
A local legend tells of Koyama Hōshi, who swam a lap with a sword clenched in his teeth, then plunged in again without it—and vanished on his third circuit. It’s folklore, not history.
“Mikuri” is written 御厨, meaning “the gods’ kitchen.” Local tradition says the pond’s water and food prepared with it were offered to Tateyama’s deity—giving the lake a deliciously sacred connection.
By the late Heian period, Mikurigaike’s volcanic scenery had been imagined as part of Tateyama’s earthly hellscape. The crater lake was one of the places where Buddhist ideas of the afterlife seemed startlingly close.
On a calm day, frame Mt. Jōdo in your photo of Mikurigaike: a heart shape appears in the water’s reflection. Toyama Science Museum’s guide points out this charming little photographic surprise.
Mikurigaike has no fish; its clear water is home to tiny water-flea-like crustaceans. A 1960 study found Daphnia 4 m down in water at 10.3°C—and noted their striking red color, probably linked to extra hemoglobin.
Scientists have used Mikurigaike’s annual sediment layers to reconstruct environmental changes over 2,850 years. Its quiet lakebed is a long record of change, written one thin layer at a time.
Rock ptarmigans live in the dwarf pines around the pond. In spring, they molt from white winter feathers: females become brown, while males turn black-and-white and show bright red brow combs as courtship begins.
Rainwater doesn’t simply spill over Mikurigaike’s rim: the neighboring Mikurigaike Onsen says it seeps underground toward Jigokudani, or “Hell Valley”—an unseen link between the blue lake and the volcanic landscape nearby.
A 2015 Toyama Science Museum study found sulfate in Mikurigaike’s water at more than twice levels measured 10 and 20 years earlier, while pH had fallen 0.4–0.5—as nearby Jigokudani fumaroles strengthened.
