In Japan an onsen is a place where hot water naturally springs out of the ground for you to enjoy. We took a trip to Takaragawa-Onsen, an onsen about 2 1/2 hours from Tokyo. The water has an ever so slight hint of sulfur. A rotemburo is an onsen located outside, so you can enjoy the hot water as you contemplate nature.
In this particular onsen, women were encourages to wear “modesty towels” which actually worked just fine for me. I basically tied a towel around me then dipped in the water. It was hot, really hot, and very relaxing. For obvious reasons, we were asked not to take pictures in the onsen. This picture is taken quite a distance away. You may be able to spot in between the buildings some water which is where the onsen is located.