Public mixed onsen

3years ago during winter I went to Hokkaido and I went to a open air public onsen inside a forest which is not belong to any hotel or company. It is so magical. Anyone can just soak in there. Now I am going back to Hokkaido again and wish to visit such onsen. But I have no idea how to search for this type of onsen again, and I can't remember how did I got one 3 years ago . Can someone pls recommend me some? I will be staying near by jozenkei & Sapporo

Have a look at this

https://blog.heli.life/ski-ride/top-rated-onsens-in-hokkaido/

I do recall one located in the forest but can�ft remember the name. I�fll have to look further.