Mt Akagi

Mt Akagi (Japanese: 赤城山) is a hyakumeizan* range that rises above central Gunma as a broad volcanic massif. It's a mountain made not of a single peak but of an entire range of crater rims, ridges and high plateaus. At its heart lies Lake Onuma, a beautiful caldera lake that gives Akagi its distinctive shape and which freezes over in winter. The topography is varied and atmospheric with forested slopes, open volcanic basins and a ring of peaks that form the remnants of ancient eruptions.

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Access to Akagi is straightforward but long. The road climbs steeply from the plains, winding through thick forest before finally reaching the high lake area. From the car park, the hike to the summit is relatively easy, though steep in places. The trail rises through mixed forest, then opens onto volcanic ridges that offer wide views. On clear days, Mt Fuji (富士山) appears far to the south, a perfect cone floating above the Kanto plain. The summit is called Mt Kurobi (黒檜山) and provides views north to Mt Tanigawa (谷川岳) and other peaks marking the border of Gunma and Niigata.

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I’ve climbed Akagi several times, and each season has its charm, but winter is my favourite. The air is crisp, the lake often rimmed with ice, and the volcanic ridges feel sharper and more dramatic. Winter, however, demands proper equipment including spikes or crampons and warm layers. The trails can be icy, and the wind on the ridges is fierce.

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Mt Akagi may not have the alpine drama of the North Alps, but its volcanic landscape, accessible summit, and sweeping views make it one of Gunma’s most rewarding mountains. 

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* 100 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.)