Hyakuhiro Falls was added to Your Favorites!
Chichibu-Tama-Kai NP, Tokyo
Claim this place to tell your story your way.
Hyakuhiro means “100 arm-spans”—about 150 m—but the falls are around 40 m high. The name isn’t a measurement: the local tourism association says it evokes the waterfall’s grand scale.
A Forestry Agency profile records Kawanoori Valley water supplying 2,739 households (5,496 people). Even after many rainless days, Hyakuhiro Falls loses little flow—a natural “sponge” effect from its surrounding water-source forest.
Even in midsummer, the falls can feel chilly: the deep, shaded gorge keeps the stream cold, and spray cools the air as it evaporates. A national-park ranger documented this refreshing microclimate at Hyakuhiro.
In late July and early August, yellow Tamagawa hototogisu and iwatabako bloom on rocky streamside slopes near the falls. The bright yellow blossoms stand out in the dim gorge.
In winter, Hyakuhiro can partly freeze into an icefall. Tokyo’s environmental bureau notes that frozen falls can be seen here—a striking seasonal change from the cool, flower-lined gorge of summer.
