This hot spa bath is actually a rock pool joined to a lake by a small stream. The hot spring water goes out ..the cold lake water comes in. Through the crystal clear water you can see bubbles rising from the spring, in the gravel at the bottom of the pool. In Japan this is called a Rotenburo... and that simply means an Outdoor Spa Bath. Almost every Ryokan, Minshuku or Spa Resort that Toursgallery put their tour groups in will provide one of these for guests to use for free. All accommodation also provide an indoor bath as well. No, you do not wear a swimming costume in the bath. So as not to upset anyone viewing this, we have cut out all the images of naked people. For more info see www.toursgallery.com (less info)