Tokushima Miyoshi City
A natural onsen at the bottom of the gorge, fed straight from the source and reached by the inn’s own cable car
Hotel Iya Onsen is an onsen inn in Miyoshi, Tokushima Prefecture. It sits in the Iya Valley, one of Japan’s three great hidden regions, and its natural onsen lies at the bottom of the gorge, reached by the inn’s own cable car down the cliff, with water fed straight from the source, never recirculated. At the open-air bath, built to jut out over the Iya River, water welling up naturally from the ground wraps your whole body in fine, champagne-like bubbles. From the panoramic main bathhouse inside, you look down on a sweeping view of the Iya Valley, framed by the windows like a painting. The silky, slippery feel of the alkaline water is a pleasure on the skin, and you can surrender to the stillness of the wild for a luxurious escape from everyday life.

These open-air baths wait at the bottom of the gorge, at the end of the ride down on the inn’s own cable car. Built to jut out over the Iya River, they are filled with abundant water that wells up naturally, fed straight from the source, never recirculated. White mineral flakes drift in the water, and fine, champagne-like bubbles gently wrap your whole body. Listening to birdsong and the murmur of the river, you can savor a rustic soak that feels at one with the wild.

An airy panoramic main bathhouse where the line between inside and outside seems to disappear. With the Iya Valley as a borrowed backdrop, a vast panorama spreads out like a painting, and from the bath you can watch clouds drift past as if dancing and take in the soft sunlight. The silky, slippery alkaline water wraps smoothly around your skin, bringing a free and blissful sense of relaxation, as though you were floating in the sky.

A private open-air bath where you can have a natural onsen, fed straight from the source, never recirculated, all to yourself. Surrender to the fresh water spilling over the edge of the tub and listen for as long as you like to the sounds of the valley. Free from anyone else’s gaze, you can enjoy a luxurious moment with the air of this hidden region all to yourself.

Some guest rooms come with an open-air bath or a panoramic bath overlooking the beautiful valley below. From your private terrace, you can take in the spectacular scenery and clear air of the Iya Valley and soak as often as you like, whenever you like. It is a special space that promises a refined, undisturbed stay.
Availability and rates are shown on each booking site.
This page contains affiliate links. Booking through them costs you nothing extra.
[Day-trip bathing] 7:30 to 17:00 (last entry 16:00)
Train and bus
Shuttle
Free parking for 37 cars (first come, first served)
Tokushima
A natural onsen in Naruto overlooking a boat racecourse
Tokushima
An onsen inn in Oboke Gorge overlooking the Yoshino River, where onsen and sauna set body and mind free
Tokushima
A rich, celebrated onsen fed straight from the source, and a sauna true to its Finnish roots