Mt Kaikoma

Mt Kaikoma (Japanese: 甲斐駒ヶ岳) is one of the great granite hyakumeizan* peaks of the South Alps. Rising at the northern end of the Akaishi range, it stands as a sharp contrast to its neighbour Mt Senjō (仙丈ケ岳). Kaikoma is harder, more angular and to my mind more demanding. Its pale granite and boulder fields give it a distinctive character, and its summit ridge feels like a true high‑mountain environment.

​

The mountain’s geology is central to its identity. Kaikoma is built from massive granite uplift, weathered into slabs, gullies, and gravelly slopes that require careful footing. The pale rock catches the light beautifully, especially in early morning or late afternoon, but it also creates unstable paths where slipping is easy, particularly on the steep, loose sections near the summit. In winter, the granite becomes treacherous, and in all seasons only experienced climbers should attempt the route leading towards Mt Nokogiri (鋸岳).

​

I especially enjoy the loop course from Kitazawa Pass up to the summit and then down toward Sensui Pass. From Kitazawa, the trail begins in deep forest, rising steadily through cedar and fir before breaking above the treeline. Just when you think you’re close to the top, the route drops down again into a rocky ridge, forcing you to regain lost elevation before the final push.

​

The flora and fauna shift dramatically with altitude. Lower slopes are rich with forest life: deer, birds and thick undergrowth. Higher up, hardy alpine plants cling to cracks in the granite, and raichō rock ptarmigans sometimes appear on the ridges. 

​

From the summit, the views are superb. Senjō’s broad plateau to the south, Mt Kita (北岳), Mt Ho'o (鳳凰三山) and the long ridges of the South Alps stretching into blue distance, and the deep valleys that carve the range into dramatic relief. 

​

* 100 famous mountains of Japan

​

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