This is a smaller pond, opposite of Oyunuma Pond, called Okunoyu (奥の湯, literally Hot Water in the Back). It's another steaming puddle of natural bright blue mineral-saturated water. Not recommended to go for a dip.
taken on 18 August 2017, 14:56
location: Noboribetsu Onsen in Noboribetsu, Hokkaidō, Japan