Hachiman-numa Pond at 1,600 m above sea level is the largest marsh in Hachimantai Plateau, where there are many volcanic crater ponds including Gama-numa Pond and Kagami-numa Pond. The swamp around Hachiman-numa Pond consists of high moor with thick peat soil and snowy wetland on the steep slope with thin peat soil. The pond is located in the primary forest of Abies mariesii and Tsuga diversifolia near the top of Mt. Hachimantai. Visitors can enjoy mizubasho (Japanese skunk cabbage) and nikko-kisuge (yellow alpine lilies). Since the alpine roads of the Hachimantai Aspite Line and the Jukai Line became toll free, the area is visited by more visitors. As the mountain trail has few ups and downs, it is popular among beginner climbers. The mountain is crowded with people when alpine flowers are in bloom.