A peak with an elevation of 903 meters, east of Mt. Amamizu and close to the Tsunan entrance to the Shin-etsu Trail. There is a gap allowing wind to blow through the area, so there will be a cool breeze blowing here even in summer. Muji Campground Tsunan (membership required) is nearby, and there is also a trekking route through the wind gap.
More information at the Naeba-Sanroku Geopark.