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Ōtsuka Onsen

Gunma · 大塚温泉

Ōtsuka Onsen is a hot spring town in Gunma, Japan. The water leaves the ground at 32.8°C, cool enough that the baths here are usually reheated. It measures pH 7.84 — mildly alkaline, the slippery kind. Officially the water is classed as simple spring. Its sources put out around 700 litres a minute. 1 inns take visitors here with room for about 20 guests.

Getting there

From Tokyoabout 2 h

CarNot needed

JR PassCovers the train

1. Train to Nakanojō Station (JR)
2. Local bus, about 20 min

Fly into Haneda or Narita. Times are rough estimates worked out from station locations, not a timetable — check the exact route on Google Maps.

The water here

Simple spring 単純温泉

Mild and low in dissolved minerals. Usually clear and gentle on the skin, which is why these baths are often recommended for first-timers.

With tattoos

Many public baths still turn away visible tattoos, and the rule is set by each bath, not by the town. The reliable way round it is to bathe privately: a room with its own open-air bath, or an inn with a private bath you can book for yourselves.

More on tattoos and onsen

Where to stay

Opens Rakuten Travel, which lists inns in English. Onsen Guide earns a commission if you book through these links, at no extra cost to you.

Hot spring towns nearby

Similar water elsewhere

Towns further away with the same kind of water — useful if this one is hard to reach or fully booked.

The numbers

Water temperature

32.8°C

pH

7.84 (mildly alkaline)

Discharge

700 litres a minute

Inns

1

Guest capacity

20

Address in Japanese

群馬県吾妻郡中之条町大塚温泉

Figures from the town's Japanese Wikipedia article.

Read more

Japanese Wikipedia