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Asahi Onsen Yamagata Oguni

Oguni, Yamagata (Tohoku), Japan
Asahi Onsen Yamagata Oguni
Location
Oguni, Yamagata (Tohoku), Japan
Water type
sulfurous
Temperature
41 °C
pH
6.5

Water profile

Thermicity
Sedative
41 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Bio-active
LowHigh

Rich in active gases or metals — a strong mineral character.

Buoyancy
Standard buoyancy
LowHigh

Soft water — natural, classic buoyancy.

SoufreSulfuresSulfates

Asahi Onsen Yamagata Oguni is a mountain hot spring in Oguni Town in the western mountains of Yamagata Prefecture, a rural community at the edge of the Iide Mountain range where traditional farming, forestry, and the seasonal cycles of a highland agricultural community define daily life in a landscape of dense beech and oak forest that turns to spectacular crimson and gold each October in one of Tohoku's most beautiful autumn foliage displays. The Iide Mountains form the boundary between Yamagata and Niigata prefectures and offer challenging hiking routes through subalpine terrain largely free from tourist infrastructure, providing genuine wilderness immersion for those willing to leave the marked trails of the better-known mountain resorts of Yamagata's interior. The sodium-sulfate thermal waters here offer authentic mountain community hospitality in a small, unhurried village where the hot spring bath is woven into the daily rhythms of agricultural and forest worker life in one of the Tohoku region's most genuine rural landscapes.

Insider tip — Asahi Onsen in Yamagata's Oguni area draws sulfurous waters shaped by volcanic activity at the Asahi mountain range on the Yamagata-Niigata border. The distinctive egg-smell at 41°C is a hallmark of active geothermal zones and is beloved by onsen connoisseurs for its skin-cleansing properties. The surrounding beech forests are spectacular in autumn gold.
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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 sulfurous water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).