内津温泉 is a hot spring town in Aichi, Japan. It measures pH 4.6 — mildly acidic.
The water type for this town has not been identified yet. It is on the list to check.
Figures from the town's Japanese Wikipedia article.
35.3270, 137.0662 — open the map
Planning a first soak? Read how an onsen stay works, and what to do if you have tattoos.