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Minami Alps NP, Yamanashi / Shizuoka
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Ainodake nearly kept the name Nōtori: an 1814 gazetteer called the middle peak Nōtori, after its bird-shaped snow pattern marked the farming season. A second “farm bird” on the southern peak eventually settled the name there instead.
In 2014, Japan’s Geospatial Information Authority revised Ainodake’s listed height from 3,189 m to 3,190 m. That ties it with Okuhotaka in the official elevation tables.
Ice-age glaciers carved high, bowl-shaped hollows into Ainodake’s slopes, including Hosozawa and Kitazawa cirques. One geological interpretation suggests its broad summit may be all that remains after a former top, tens of metres higher, collapsed.
In mid-July, the floor of Hosozawa Cirque east of the summit can fill with yellow alpine flowers, including a striking stand of Shinano-kinbai (Trollius japonicus).
Ainodake divides two river systems: the Noro River flows toward the Fuji River, while the Oi begins on the mountain’s southern side. On the trail toward Kumano-daira, the Oi’s first trickle is just a tiny spring.
On August 18, 1881, British diplomat Ernest Satow crossed from Nōtori-dake to Ainodake. The climb was part of his major summer journey through the South Alps.
Ainodake belongs to a range that is still rising: Japan’s Environment Ministry reports uplift of 3–4 mm a year across the South Alps. Rain and slope collapses continually reshape the steep valleys.
