
Photo: STA3816 · CC BY-SA 4.0 · Wikimedia Commons
玄海さつき温泉 is a hot spring town in Fukuoka, Japan. The water leaves the ground at 30.3°C, cool enough that the baths here are usually reheated. It measures pH 9.35 — strongly alkaline. Officially the water is classed as simple spring. Its sources put out around 125 litres a minute. 1 inns take visitors here.
Mild and low in dissolved minerals. Usually clear and gentle on the skin, which is why these baths are often recommended for first-timers.
Figures from the town's Japanese Wikipedia article.
33.8613, 130.5254 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.