Shibahara Onsen is a hot spring town in Saitama, Japan. The water leaves the ground at 9–11°C, cool enough that the baths here are usually reheated. It measures pH 8.1 — mildly alkaline, the slippery kind. Officially the water is classed as sulfur spring. Its sources put out around 2 litres a minute. 2 inns take visitors here.
The classic rotten-egg smell and milky white water. It can tarnish silver jewellery, so take it off.
With tattoos
Many public baths still turn away visible tattoos, and the rule is set by each bath, not by the town. The reliable way round it is to bathe privately: a room with its own open-air bath, or an inn with a private bath you can book for yourselves.