is a high altitude in the Oze National Park, Japan.
Approximately 8 km2 in size, the marshland is well known for various species of plants, including the "mizu-bashō" (White Skunk Cabbage), "Nikkōkisuge" (yellow alpine lilies, Hemerocallis dumortieri var. esculenta) and "Watasuge" (Eriophorum vaginatum). The marshland is a popular hiking destination.