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Oze NP, Fukushima / Niigata
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Japan’s Environment Ministry calls Sanjo Japan’s highest-volume waterfall. About 80m tall and 30m wide, it receives streams from Ozegahara; snowmelt swells the upper Tadami River into a particularly powerful torrent.
Ozegahara’s streams pass Sanjo Falls, then flow through the Tadami and Agano rivers to the Sea of Japan. But some water from nearby Lake Ozenuma takes a remarkable detour through a power tunnel toward the Tone River and Pacific.
In 1948, planners proposed a 100m dam to turn upstream Ozegahara into a vast reservoir. The next year, the Oze Conservation Association formed to oppose development; it became the predecessor of today’s Nature Conservation Society of Japan.
About 1km upstream, Hiraname-no-Taki glides across bedrock for roughly 500m. Then the Tadami reaches Sanjo and plunges over a cliff—a striking change from a long, smooth slide to a roaring drop.
Lava from Mt. Hiuchigatake blocked the Tadami near Sanjo Falls. The once-proposed 200m-deep lake across all Ozegahara lacks direct evidence; current understanding points instead to a shallow lake over the eastern half around 16,000 years ago.
Sanjo Falls may be named for the 3 strands its flow can form in dry periods—or its name may descend from “Sanjujo-no-taki,” meaning “Thirty-Jo Falls.” An Edo-era account also called it Fudo Falls and praised its snowmelt torrent.
The Sanjo Falls area also shelters rare plants: Fukushima classifies nearby Togakushi-so as Critically Endangered and Hakusen-nazuna as Endangered. Park managers include their habitats in a plan to protect plants from deer browsing.
