Otsuka Onsen

Agatsuma, Gunma, Japan, Japan

Location: Agatsuma, Gunma, Japan, Japan
Water type: thermal, sulfurous, acidic
pH: 6.5

Water profile

Mineralisation

Bio-active

LowHigh

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

Buoyancy

Standard buoyancy

LowHigh

Soft water — natural, classic buoyancy.

SoufreSulfuresSulfates

Otsuka Onsen is located in the Agatsuma district of Gunma Prefecture, Japan. Its sulfurous, acidic waters (pH 6.5) feed indoor and outdoor (rotenburo) baths plus a sauna, a water profile typical of Japan's volcanic onsens.

Insider tip — Otsuka Onsen in the Agatsuma/Kusatsu area of Gunma prefecture. Very close to Kusatsu Onsen, using the same Yubatake geothermal field. Highly acidic sulfurous waters (pH ~2) with a pronounced aroma and an invigorating, tingly feel on the skin. A quieter alternative to the busy Kusatsu resort town.

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Nearby

Manza Onsen Kogen Hotel

Agatsuma

Shima Onsen Kashiwaya Ryokan

Nakanojo

Shima Onsen Nakanojo

Nakanojo

Takayama Onsen; Fureai Plaza

Takayama, Nagano

Azuma Onsen; Kikyokan

Higashiagatsuma, Gunma

Higashiagatsuma Onsen

Higashiagatsuma, Gunma Prefecture

Frequently asked questions

What type of water is found here?

This spot features thermal & sulfurous & acidic water.

What is the best season to visit?

The most favourable period for this spot is: Toute l'année.