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Oze NP, Fukushima / Niigata
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Hiraname is more of a long, smooth slide than a single plunge: the Tadami River flows across a rock slab about 500 m long and 50 m wide, sloping at 25°. The falls’ name comes from their smooth shape.
Hiraname lies along the Fukushima–Niigata prefectural border, on the Tadami River. Nearby Sanjo Falls also sits on this border, making the river’s dramatic waterfalls part of a shared landscape.
The water flowing over Hiraname connects Oze to the Sea of Japan: the Tadami River gathers water from Lake Ozenuma and Ozegahara, passes this fall and Sanjo Falls, then continues toward the sea.
A 40 m deer fence at Hiraname protects rare Hakusen-nazuna. After deer slipped under a gap, managers blocked it with stones; 2021 monitoring found no deer inside, and 2 plants flowered—the first in 4 years.
