Akune Onsen

Akune, Kagoshima, Japan

Location: Akune, Kagoshima, Japan
Water type: sodium chloride
Temperature: 41 °C
pH: 7.3

Water profile

Thermicity

Sedative

41 °C

LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation

Restorative

LowHigh

Loaded with major ions — the essential minerals (Ca, Mg).

Buoyancy

Effortless float

LowHigh

Dense, salty water — you float without effort.

SodiumChloruresBrome

Akune Onsen is an iodine-rich thermal spring in Akune City, Kagoshima Prefecture, situated on the western coast of Kyushu along the Yatsushiro Sea—the sheltered inland sea whose marine geology has deposited iodine-bearing sedimentary formations that feed the spring's characteristic mineral signature with the antibacterial and skin-conditioning iodine compounds typical of Japan's coastal and former-sea-floor thermal spring tradition. Akune City's coastal position on the western Kyushu seaboard, facing the Amakusa Islands across the Yatsushiro Sea, gives this spring a maritime landscape context of considerable natural beauty in one of Kyushu's most scenically diverse coastal prefectures. The iodine mineral character of the spring connects Akune's thermal tradition to the ancient marine heritage of the Yatsushiro Sea's geological history.

Insider tip — Akune Onsen on the western Kagoshima coast draws an iodine-rich sodium-chloride spring from beneath the shallow East China Sea shelf, with a saline concentration high enough to keep bathers warm for hours after exiting. The town of Akune is known for its windmill coastline and stunning sunsets over the Amakusa Islands, best enjoyed from open-air foot baths along the promenade. The warming, heat-retaining properties of the water are especially valued by elderly residents during Kyushu winters.

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