ThermaeExplore the map →

Shin Iya Onsen

Miyoshi, Tokushima, Japan
Shin Iya Onsen
Location
Miyoshi, Tokushima, Japan
Water type
silica, thermal
Temperature
40 °C
pH
7.2

Water profile

Thermicity
Sedative
40 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Balancing
LowHigh

Rich in trace elements — gentle on the skin.

Buoyancy
Standard buoyancy
LowHigh

Soft water — natural, classic buoyancy.

SiliceSodiumBicarbonates

Shin Iya Onsen occupies one of Japan's most dramatically scenic settings, positioned in the Nishi-Iya mountain district of Miyoshi City, Tokushima Prefecture near the famous vine bridge Kazura-bashi, where the Iya Valley's deep gorge landscape of forested ridges and rushing rivers provides a theatrical natural backdrop that enhances the experience of bathing in siliceous and simple thermal waters. The spring was developed in 1988 as part of a community initiative to address local population outflow by creating a thermal tourism asset, and the inn that serves it has adopted an extraordinary feature: guests travel from the lodging to the open-air baths by cable car descending into the gorge, creating a bathing arrival experience unique among Japan's thousands of onsen. Shin Iya Onsen represents the inventive, community-driven spirit of Japanese onsen development, where a determined local effort transformed a remote mountain valley into a distinctive thermal destination that combines the geological gift of natural spring water with the engineering ingenuity of a cable-transported bathing access system.

Insider tip — Shin Iya Onsen is tucked into the breathtaking Iya Valley of Tokushima Prefecture on Shikoku island, a remote mountain gorge considered one of Japan's three great hidden regions. The silica-rich thermal waters are exceptionally smooth and promote radiant skin, while the deep canyon scenery of the Yoshino River below adds dramatic natural beauty to every soak. Access via the famously narrow and winding Iya valley roads heightens the sense of arriving somewhere genuinely off the beaten path. The area's traditional thatched-roof farmhouses and vine bridges complete an atmosphere of ancient rural Japan.
Find hotels nearby →Tickets & activities →See the map & practical info →

Nearby

Frequently asked questions

How hot is the water?
The water runs quite hot here, around 40 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features silica & thermal water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).