The baths here are filled with 100% natural hot spring water, as is from the source. Enjoy this hot spring which is highly popular with customers! The spring water wells up naturally from 2,000 meters underground, bringing a plentiful supply of spring water to the surface at a rate of 600 liters per minute. The chocolate-colored water here is also known to beautify bathers' skin. Kick back, relax and soothe the fatigue from your body in these natural hot spring baths. Baths Communal baths with a view of Lake Kameyama, the largest lake in southern Chiba Prefecture. The hot spring baths here have so much to offer!