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Chubu-Sangaku NP, Toyama
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At Kumonodaira Hut, dried cod is soaked for half a day, then served at breakfast in tomato or white-wine stew. Once a North Alps hut staple, it’s a time-tested way to make shelf-stable fish taste home-cooked.
Kumonodaira’s gentle top is an old lava plateau, built in two acts: an early volcano about 900,000 years ago, then renewed eruptions 300,000–100,000 years ago, after a roughly 600,000-year pause.
A faraway eruption helped shape this wetland: about 9,000 years ago, ash from Japan’s Kikai Caldera reached Kumonodaira. The deposit helped impede drainage, setting the stage for the plateau’s soggy grassland.
The plateau’s living soil is surprisingly thin: a forestry-agency report estimates just 10–30 cm of topsoil formed since about 9,000 years ago. High-altitude conditions slow the tiny organisms that build soil.
Here, snowmelt helps decide which plants grow where: early-melting patches support tall grasses, while intermediate snowbeds host alpine flowers. The latest-melting ground can stay bare—the growing season is too short for plants to set seed.
Kumonodaira’s named garden corners sound like a world tour: Swiss Garden, Alaska Garden and Greek Garden are actual local place-names among Japanese alpine grassland, ponds and volcanic rocks.
Even “Kumonodaira” has an uncertain origin. One explanation is that clouds creep over the flat plateau; another says snowmelt reveals spider-shaped patches of bare ground. The mountain hut’s history records both as theories, not settled fact.
Kumonodaira’s founder, Shōichi Itō, was a young aviation-engineering researcher whose work ended with Japan’s defeat in 1945. He turned to mountain huts and first visited Kumonodaira in 1947, deciding to build there.
Before Kumonodaira Hut could be built, Itō’s new access route, Itō Shindō, opened in 1956. Hut construction began in 1959, was mostly finished in 1961, and reached completion in 1963.
Kumonodaira’s vegetation-restoration work grew from concern about damage along the trails. Since 2008, the mountain hut, university researchers and forestry authorities have worked together to restore its fragile alpine ground.
