Mt Higashi-Akaishi

Mt Higashi‑Akaishi (Japanese: 東赤石岳) is a nihyakumeizan* peak that rises sharply above the rugged Akaishi range of eastern Shikoku, a mountain known for its steep rocky ridges, rare alpine plants and the dramatic eology that shapes its upper slopes. It is a celebrated flower mountain, home to rare species that thrive in its unusual rock environment. The summit ridge is a narrow, jagged exposed crest of dark stone that stands in contrast to the gentler bamboo‑grass highlands found elsewhere in Shikoku.

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The mountain rises above the cities of Niihama and Shikokuchūō, forming the core of the Akaishi massif, a rare zone of true rocky alpine terrain in Shikoku. The bedrock creates a harsh soil environment where only specialized plants survive, making the mountain a magnet for botanists and hikers seeking unusual alpine flora.

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The Ikadazu trailhead is the most commonly used and best‑maintained starting point for Mt Higashi‑Akaishi, and is where I began my hike. It's at the end of a long winding mountain road from Niihama and serves as the standard route for day hikers. The trail begins in forest and quickly enters rugged terrain with stream crossings, rocky gullies and steep, narrow sections where chains assist progress. Care is required on numerous sections. It's a full mountain day with roughly 1,100 metres of elevation gain.

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As hikers climb, the forest thins and the landscape shifts into the mountain’s signature rocky world. After reaching the rocky summit and its views back to Niihama, the Inland sea and south towards the Shikoku mountains, the loop course passes Akaishi Sansō, an abandoned hut at around 1,550 metres. From the summit, it's possible to take the adventurous route over the exposed ridge, or take a safer traverse below the ridge and through the forest. There was no one else on the mountain when I was there and I chose the latter. 

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* 200 famous mountains of Japan

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