Eriophorum vaginatum
Approximately 8 km2 in size, the marshland is well known for the 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.