Oyunuma is the remains of an explosive crater, and is a gourd-shaped swamp of hot water. At the bottom of the swamp, sulfur springs spout out at about 130 degrees Celsius, and the temperature on the surface of the swamp is 40 to 50 degrees Celsius. At the bottom of the swamp, sulfur springs spout out at about 130 degrees Celsius. You can see Oyu-numa from here. If you are on your way to the Oyunuma River Natural Footbath on the boardwalk from the valley, you can reach this observatory in 10 minutes on foot from Jigokudani.
Information
Oyunuma Observatory
Location Noboribetsu Onsen-cho, Noboribetsu City, Hokkaido 059-0551
Directions
Oyunuma Observatory
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