Mount Akagi

Mount Akagi (赤城山, Akagiyama) is a massive, multi-peaked stratovolcano in central Gunma. It is revered as one of the “Three Mountains of Jomo” (Jōmō-sanzan), alongside Mount Myōgi and Mount Haruna. The mountain is most famous for its central caldera, which houses the scenic Lake Onuma. In autumn, particularly throughout October, the slopes transform into a vibrant display of red and gold, making it one of the most popular leaf-peeping destinations in the northern Kanto region. On clear days, the ridgelines offer spectacular views extending across the Kanto Plain to the skyscrapers of Tokyo and even the distant peak of Mount Fuji.

Hiking is the primary draw for visitors, with a well-trodden loop trail starting from the parking lot near the lake. The trek typically involves ascending the highest peak, Mount Kurobi (1,828 meters), and continuing along the ridge to Mount Komagatake. This circuit takes approximately 3 to 4 hours to complete. For a less strenuous experience, many visit the Akagi Shrine, which sits on a small peninsula jutting into Lake Onuma. The shrine’s bright vermilion bridge and buildings provide a stunning contrast against the blue water and forested slopes. In the winter months, the lake freezes over completely, attracting crowds for “wakasagi” (smelting) ice fishing. This year-round versatility, combined with its mythological history as the rival of Nikko’s Mount Nantai, cements Mount Akagi as a cornerstone of Gunma’s natural identity.