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Yakushima NP, Kagoshima
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“Senpiro” means a thousand armspans. The name celebrates the enormous granite wall beside the falls, imagined as broad enough for 1,000 people to stand hand-in-hand across it.
The river below Senpiro is part of Mugio’s working landscape: Tainoko River water helped open rice paddies there in 1911 and now irrigates orchards and fields in a district known for ponkan and tankan citrus.
Senpiro is one stop on the Tainoko River’s waterfall journey: the river drops over Senpiro, then Ryujin Falls, then Toroki Falls, which tumbles from the coastal cliff straight into the sea.
The path that brings visitors closer to Senpiro began as a work route for maintaining an agricultural water intake. Yakushima Town opened it to the public on June 25, 2023.
Senpiro’s vast gray backdrop is Yakushima granite emplaced around 15–16 million years ago. The Geological Survey of Japan identifies the falls as formed on this ancient island rock.