Onsen Type: Sulfur-containing hydrogen carbonate salty water.
Onsen Hotels: 15
Yunomine Onsen is Onsen Town located nearby Kumano Hongu Shrine. It's been popular Onsen Town for travelers of Kumano worshipers.
It is considered as the oldest Onsen Town in Japan.
There is Onsen Spring for boiling Eggs and Vegetable. Onsen Eggs takes about 12 min. and Sweet Potato is takes about 40 min.
Tsuboyu is the Oldest Public Onsen in Japan. It is a rock with Onsen spring. It has a shape of pot that contains 3 people. The water is very hot, so you have to adjust the temperarture with water. You pay at the office of the public Onsen.
This site is registered as The UNESCO World Heritage Site, "Sacred Sites and Pilgrimage Routes in the Kii Mountain Range."
The web site: http://www.hongu.jp/en/onsen/yunomine/