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Towada-Hachimantai NP, Iwate
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From Gentamori, Hachimannuma looks like one broad lake—but geologists identify 11 crater hollows joined end to end beneath it. The latest eruption in this crater group was about 7,000 years ago.
Local legend links Gentamori’s name to scout brothers Genta Tadayoshi and Tadaharu, who supposedly reached this ridge while searching for enemies. It’s a place-name tale, not verified history.
Snowmelt brings white Hina-zakura to the wetlands along Gentamori’s trail. This primrose grows naturally only in northern Honshu; Hachimantai’s visitor center recorded it flowering in the summit area in June 2024.
Footsteps once stripped peat from wetlands along the Hachimantai–Gentamori ridge, prompting restoration from 1993. At nearby Genta-wakare, a treated 2×2 m plot held 9 plant species; runoff washed restoration mats from other plots.
