Photo: Abasaa · Public domain · Wikimedia Commons
Shiobara Onsen is a hot spring town in Tochigi, Japan. It measures pH 2.6–9.2 — acidic. Officially the water is classed as chloride spring, bicarbonate spring, sulfate spring and sulfur spring. Its sources put out around 10,000 litres a minute. 60 inns take visitors here.
Salty water. The salt leaves a thin film on the skin, so you stay warm well after leaving the bath.
Smooth, slightly slippery water. Often nicknamed bihada-no-yu, the water for beautiful skin.
Clear water with a faintly bitter taste. Known for holding heat.
The classic rotten-egg smell and milky white water. It can tarnish silver jewellery, so take it off.
Figures from the town's Japanese Wikipedia article.
36.9685, 139.8231 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.