Marunuma Onsen

Gunma · 丸沼温泉

Marunuma Onsen is a hot spring town in Gunma, Japan. The water leaves the ground at 48°C, hot. It measures pH 7.5–7.65 — close to neutral. Officially the water is classed as simple spring. Its sources put out around 300 litres a minute. 1 inns take visitors here with room for about 170 guests. About 8,000 people a year come to bathe.

Getting there

From Tokyoabout 2 h

CarNot needed

JR PassCovers the train

Train to Jōmō-Kōgen Station (Shinkansen)
Local bus, about 24 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.

Simple spring

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.

Rooms with an open-air bath — Gunma Inns with a private bath — Gunma