The Okushimanto TrailRace in Matubagawa is a solo trail race held in Shimanto, Japan. The long course covers 35.6 km with 1,980 meters of elevation gain. It begins at 8:00 AM, qualifies for the 50K category in the UTMB Index, and holds ITRA certification with Mountain Level 6 and Finisher Level 3 ratings.
The route features 1,980 meters of descent, mirroring the climb, presenting runners with a full mountain profile instead of a simple dirt road course. The long race has a 9-hour time limit and three aid stations. Fields typically consist of around 400 participants, with one edition showing 169 finishers. Japanese runners are prominent at the front of the results, as seen with Yuta Nasu winning the men's race in 4:12:18, followed by Kenichi Horie and Makoto Endoh.