According to Ministry of the Environment statistics, Okinawa (Kyushu & Okinawa) has 15 onsen areas and 22 hot-spring sources. This page lists 6 onsen in Okinawa with their water types. The most common water type among them is Chloride Spring (3 onsen).
Source: Ministry of the Environment, FY2024 Hot Spring Utilization Survey (as of March 31, 2025). Best-known onsen = most annual Wikipedia views.
| Water Type | Count | Share |
|---|---|---|
| Chloride Spring | 3 | 50% |
| Simple Thermal Spring | 1 | 17% |
| Bicarbonate Spring | 1 | 17% |
| Sulfate Spring | 1 | 17% |
| Facility | Water Type |
|---|---|
| Natural Hot Spring Aroma | Other Iodine-bearing salt spring |
| Yuinchi Nanjo Onsen Day-Bathing Facility A day-use bathing facility in Nanjo City, Okinawa Prefecture. | Chloride Spring Sodium – strong chloride spring |