This is a 20ha marshland in the Madarao Highlands in Niigata Prefecture. Exploring the marshland in mid-July ▼This is a fairly wide marshland. ▼Click here to see the exploration record! https://www.wetlandjapan.com/207-numanohara About equipment, physical strength, and skills There are short courses that take about 40 minutes to go around, and long courses that take 1 hour and 30 minutes. ...