Mt. Kurofu
Mount Kurofu (Kurofu-yama), standing at an elevation of 2,404 meters, is located approximately 3 km west of Mount Asama, on the border between Gunma and Nagano Prefectures. Part of the Asama Volcanic Region, this mountain is connected by a semi-circular ridge that includes peaks like Tomi-no-Kashira (2,320m), Mount Kurofu, Jakotsu-dake (2,366m), and Sennin-dake (2,319m), encircling Mount Asama. The area, including Mount Kurofu, forms the first outer rim of Mount Asama.
Geologically, Mount Kurofu and its neighboring mountains are composed of andesitic lava and tuff breccia. The Kurofu volcanic belt was once a stratovolcano similar in shape to Mount Fuji, estimated to have been about seven times the size of the current Mount Asama. An eruption thousands of years ago caused the collapse of its eastern half, shaping the present-day crater wall and the formation of Yunohana plateau.
The region is rich in flora and fauna, with the bog bilberry being prevalent, and Japanese serows often spotted on rocky slopes.
There are several hiking routes to choose from. From Karasawa Pass, the three main trails include: the Omote Course, facing south with varied scenery, which takes about 1 hour and 30 minutes; the Middle Course, which passes through bright woodland, also taking around 1 hour and 30 minutes; and the Ura Course, which traverses through dense forests of Abies veitchii, requiring about 2 hours. Additionally, from Yunohana, you can ascend using routes like the grass slide or the J Band, leading up to the ridge.
*Before heading out on a hike, make sure to stay updated with the latest information on trails and other important details.