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Hidakasanmyaku Erimo Tokachi NP, Hokkaido
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In a regional Ainu legend, the thunder god’s sister finds no cooking smoke near the Saru and Mukawa headwaters. The gods turn willow leaves into shishamo and send the fish down the Mukawa to save hungry villages.
Real shishamo—not the capelin often sold as a substitute—is native only to Hokkaido’s Pacific coast. It swims up the Saru to spawn in autumn; the basin’s seasonal catch was traditionally dried in curtain-like rows.
At Nibutani’s annual Chipsanke, a traditionally made boat is launched and its soul welcomed. People tell the river god it is built and thank the mountain god for its wood; before bridges, boats linked Saru-side villages.
Big floods periodically scour the Saru valley. Over time, they help keep bamboo grass from taking over elm woods, allowing useful plants such as edible lily and wild garlic to return—an ecological cycle that also supported Ainu life.
The Saru basin still has many freshwater pearl mussels, once valued by Ainu communities. Their tough shells were shaped into pipa, tools for clipping grain ears—a river mussel helping bring in the harvest.
The 1997 Nibutani Dam case brought the Saru River to a landmark court ruling: Sapporo District Court recognized the Ainu as Indigenous people and found the land-taking unlawful, yet left it in place because cancellation would harm public welfare.
Nibutani Ita trays and Nibutani Attus bark cloth, both from the Saru basin, became Hokkaido’s first nationally designated traditional crafts in 2013. The trays are known for intricate scale-pattern carving; the cloth is woven from tree-bark fiber.
In the Saru cultural landscape, willow branches provide wood for inaw, Ainu ritual offerings; nearby elm woods support useful plants including edible lily and wild garlic. The river’s banks and forests were a source of both materials and food.
The National Ainu Museum’s guide to the Saru dialect draws mainly on speakers from this river basin. It even notes subtle differences between speech upstream and downstream—a local voice shaped along the length of the river.
About 30 kilometers of the Saru’s upper valley, with forest on both banks, were designated a national natural monument in 1970. The Saru River Headwaters Primeval Forest protects a striking stretch of conifers and birch woodland.
Older records call the Saru Sisirimuka, a name explained in government river histories as referring to a mouth blocked by sediment washed down from upstream—a practical observation of how this river’s outlet could change.
Wide high-water terraces along the Saru are used for haymaking and horse pasture. They form part of Hidaka’s breeding landscape, whose farms produce about one-fifth of Japan’s light horses.
In the late Meiji era, the Saru doubled as a timber highway: logs cut in the mountain forests were floated downstream. By the end of that era, railways had taken over the job.
