The marsh is located on the middle of the Ozenuma South Shore Road, on the mountain road from the Osei Horizontal Branch and climbing a steep slope. There are people who mistake it as the road to Oshimizu, but the road leading to the Fujimi Pass continues. Since there are few people who pass the road ahead from Daesin Horizontal, the road is rough, so beginners should keep a round trip to Daesin Horizontal. Although Daesei is a small-scale moor surrounded by conifers such as Oshitai and Cometsuga, it can be met by a community of chunky, tawny midges. It is a water source that pours into Oze-numa, and you can see Mount Hiyunke over the head of the forest. Care must be taken not to deviate from the mountain trail when snow remains. About 20 minutes from the Oshimizu branch.