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Yoshino Kumano NP, Nara / Mie
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Local saying: “Forget your lunch, but not your umbrella.” Odaigahara gets about 3,000–3,500 mm of rain a year: moist air rises from the Kumano Sea, just 20 km away, then cools on a 1,500 m slope.
At 1,695 m, Hidegatake is Mie Prefecture’s highest point. On an exceptionally clear early morning, the summit lookout can even reveal distant Mount Fuji.
The plateau around Hidegatake divides water among the Miyagawa, Kumano and Kii rivers, which flow to Ise Bay, the Kumano Sea and the Kii Channel. One mountain landscape feeds 3 different coasts.
Along the Hidegatake–Masaki Ridge trail, today’s open bamboo grass replaced mossy forest. The 1959 and 1961 typhoons opened the canopy; fallen-tree removal contributed to a drier forest floor, while sasa and deer browsing hindered regrowth.
Odaigahara folklore blamed sudden weakness on the trail on Hidarugami, a hungry spirit. Hikers were said to leave a bite of lunch as an offering—and even 1 grain of rice was believed to help someone the spirit had seized.
Matsuura Takeshiro, known for helping name Hokkaido, first climbed Odaigahara at 68 in 1885. He returned at 69 and 70, spending his own money to improve paths and build huts for local climbers.
The broad high ground around Hidegatake is not a volcanic plateau. It is a rare raised peneplain: an old, gently eroded surface that was lifted as the surrounding land rose, leaving an unusually level landscape high in the Kii Peninsula.
Near Hidegatake’s summit, special weather sustains a “quasi-subalpine” forest of spruce, fir and hemlock. In the Kii Peninsula, this distinctive vegetation survives only on Odaigahara and the Omine ridge tops.
In 1895, a first-order triangulation marker was installed on Hidegatake’s summit, part of Japan’s foundational surveying network. That same year, botanist Shirai Mitsutaro surveyed Odaigahara’s plants; he later spoke out against logging.
Ascetic Furukawa Takashi made Odaigahara his training ground in 1891, staying about 100 days, then returning to spend 3 winter months there alone. He went on to build the Odaikyo religious hall, completed in 1899.
