Nanamaki was a ski area located in the Nanagamaki neighbourhood of Nozawa Onsen Village in the north-western region of Nagano Prefecture. It was to the north of the famous Nozawa Onsen ski area - less than 3km direct or just over 10km by road.
Skiers would get off the train at nearby Kuwanagawa Station, take a ferry boat across Chikuma River and then walk about 1km to get to the ski hill. Nanamaki was the end point of a popular tour course coming down from the Uenotaira area of the Nozawa Onsen ski area.
Nanamaki closed in 1982 and apart from the concrete foundations of the ski lift and base building, little evidence of the ski area remains.
More information and photographs here: