Mt Iwadono

Mt Iwadono (Japanese: 岩殿山) is a Yamanashi hyakumeizan* that rises directly above Ōtsuki in eastern Yamanashi, a steep, rocky peak whose dramatic cliffs make it one of the most visually striking small mountains in the region. Though only a mid‑elevation summit, its topography is impressive with a sheer rock face, narrow ridges and a summit crest that perches above the Katsura River valley. This distinctive shape has made Mt Iwadono a long‑standing local landmark and instantly recognizable from the Chūō Line.

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The mountain’s significance is both historical and cultural. The summit area holds Iwadono Castle ruins, a  mountaintop fort that once controlled the routes between Kai Province and the Kantō plain. Stone walls, terraces and old defensive earthworks remain scattered across the ridge. Because the mountain stands alone, its summit offers a surprisingly wide panorama including Mt Fuji (富士山) Daibosatsu (大菩薩嶺) and Mitsutōge (三峠山)

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The hike is short but steep, and I enjoyed it late one winter afternoon. Like many hikers I began walking from the Hatakura trailhead on the east of the mountain. From here you climb steeply through the forest before emerging on the summit plateau. Shortly below the summit, the path passes through the castle ruins including terraces, stone remnants and lookout points from where you can enjoy a sweeping view over eastern Yamanashi.

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* 100 famous mountains of Yamanashi

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(All information here is based on personal observations and experiences. Check official sources before planning or starting any hikes.)