Uke no Kuchi Onsen

Yufu, Oita, Japan

Location: Yufu, Oita, Japan
Water type: sodium chloride
Temperature: 40 °C
pH: 7.3

Water profile

Thermicity

Sedative

40 °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

Uke no Kuchi Onsen in Oita Prefecture flows with iodine-rich thermal waters in a prefectural landscape that is home to more geothermal spring water volume than any other prefecture in Japan, making even individual springs of relatively modest profile part of an extraordinary regional thermal heritage that encompasses Beppu's famous eight hells, Yufuin's caldera mist, and the diverse springs of Kunisaki, Nakatsu, and Usa. The spring's iodine mineral character reflects the particular geological profile of the iodine-bearing formations through which its water rises, a mineral type long noted in Japanese balneology and associated with a distinctive bathing character. Uke no Kuchi Onsen contributes to Oita's extraordinary geothermal mosaic with its distinctive iodine mineral character, offering visitors an authentic encounter with one of the more unusual mineral types found within a prefecture whose geological abundance ensures that even its lesser-known springs carry genuine mineral interest.

Insider tip — Uke no Kuchi Onsen in the Oita highlands lies near Yufuin and the dramatic twin peaks of Mount Yufu, in Japan's hot-spring capital — the prefecture with more thermal springs and greater hot-water output than anywhere else in the country. The iodine-rich sodium-chloride springs draw on the abundant geothermal energy of central Kyushu, serving a landscape of forested mountains and steaming valleys where hot-spring bathing is the defining cultural feature of a region home to the famous Beppu and Yufuin onsen resorts.

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