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Shiretoko NP, Hokkaido
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Oshinkoshin doesn’t mean “twin falls”: the name is traced to Ainu o-sunku-us-i, “river-mouth place where Yezo spruce clustered.” The split cascade separately earned the nickname “Twin Beauty Falls.”
A roadside watch at Oshinkoshin Falls recorded 32 seabird species over 2007–09. Twice, researchers spotted distant shearwater flocks estimated at more than 10,000 birds passing the coast.
In September 2012, managers logged at least 12 falls-area appearances by what they believed was the same brown bear. It was pursuing pink salmon at nearby river mouths and came close to the busy viewing area.
The falls plunge over coarse basalt, part of a dramatic local rock story: magma intruded Miocene shale, and erosion exposed striped, sideways columns nearby. That separate coastal formation is designated a natural monument.
Edo-period records don’t use today’s familiar name: one calls the waterfall “Charasei,” while a 1797 travel account describes 2 falls at “Shiyara.” They preserve a glimpse of the place under earlier names.
Oshinkoshin is a last freshwater plunge before the Sea of Okhotsk: the Charasenai River drops over the cliff near its mouth, then flows into the sea.
Before the tunnel rerouted traffic below the falls, the main road crossed the cliff above them, giving travelers a top-down view. The 1964 Takimi Bridge still marks that former vantage point.
When rain left the falls’ parking lot too wet for repainting in 2012, a local resident brought a household gas burner to dry the pavement. Residents and government staff then finished the new parking lines together.
