Niseko Oyunuma is a pond located in Yumoto Hot Springs in Rankoshi-cho, Isoya-gun, Hokkaido. The source of the hot springs is Oyunuma Pond. It is a hot water pond, which is 50 m from east to west. There is a promenade arranged around the pond, by which you can walk around it in 3 or 4 minutes. The yellow flowers of sulfur floating on the surface of the hot spring source are called spherical sulfur, which is academically very precious. The average temperature of the water is 70℃; however, it is as high as 360℃ at the hottest point. White steam and the smell of sulfur create a distinctive atmosphere. Oyunuma Pond is the most popular sightseeing spot in Niseko area, where you can enjoy the natural beauty that changes from season to season.