A very unique hot spring feeds the beautiful baths here in rural Miki. The carbon dioxide spring is one of the rarest and strongest of it's type in Japan. You cannot spend too long in the hot spring baths here because of the carbon dioxide being emitted by the spring water. Signs posted all over the baths say don't stay in for more than a few minutes at a time. The problem is that there is so much carbon dioxide coming off the water you don't breath in enough oxygen and can faint.

Besides that the gasses that could kill you, the water feels great. The landscaping in the outdoor area is beautiful. There are also private family baths here, also rare in Hyogo, for ¥4,000 an hour. Be aware that the laws governing baths are stricter in Hyogo than in other prefectures. Their website says if you want to use this bath with your wife and or children under 10 you have to bring your health insurance card that lists both of your names, and or your drivers licenses which show you living at the same address. We weren’t asked for either.