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Iki Island Onsen

Iki Island, Nagasaki Prefecture, Japan
Iki Island Onsen
Location
Iki Island, Nagasaki Prefecture, 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

Iki Island Onsen is located on Iki Island (Ikishima) in Nagasaki Prefecture, an island in the Korea Strait with a remarkable place in Japanese mythological geography — the Kojiki and Nihon Shoki creation myths identify Iki as one of the 'island children' born from the union of the creator deities Izanagi and Izanami, making it one of the primordial islands of the Japanese archipelago according to Shinto cosmology. The island also played a pivotal role in the Mongol invasions of Japan (1274 and 1281), suffering devastating attacks during both invasion fleets' advance toward Kyushu, events commemorated in local shrines and historical sites. Today Iki is known for its traditional culture, distinctive local sake production, quality beef cattle, and the famous Iki horses — small, hardy indigenous ponies that have been bred on the island since ancient times and represent one of Japan's most genetically distinct horse breeds. The onsen here provide silica-rich mineral bathing in an island setting of mythology, medieval history, and living traditional culture.

Insider tip — Iki Island Onsen is found on one of the Genkai Sea islands that served as a waystation on the ancient Japan-Korea diplomatic route, and its springs tap the same marine geology that gives the island its distinctive saline groundwater. The sodium-chloride water emerges warm and silky, a restorative balm after beach walks on the island's white-sand coves. Iki is famously uncrowded compared to Tsushima or Goto, offering a genuinely rural Kyushu island atmosphere. The sento here often displays exhibits on ancient Yayoi-period bronze mirrors excavated from island burial mounds.
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).