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Towada-Hachimantai NP, Aomori
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Kumoi Falls is said to take its name from the cloud-like spray thrown up when water strikes rock. The cascade drops about 20 m in 3 stages from a densely wooded cliff.
Kumoi is a waterfall on the move: erosion lowered Oirase’s main river below its feeder stream. Its abundant flow wears rock quickly, so it has retreated farther upstream than neighboring falls—and will eventually disappear.
In winter, Kumoi’s roughly 20 m cascade freezes into an icefall. It is one of 14 waterfalls along Oirase that can turn into ice pillars, giving the gorge a very different winter face.
Kumoi sits in Oirase’s moss-rich gorge, where surveys have found 300+ moss species. Lake Towada buffers the stream’s flow, helping moss cling even to rocks in the current.
