Japan Onsen Atlas温泉アトラス

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Kanto · Onsen area

Marunuma Onsen

まるぬまおんせん · 丸沼温泉

Gunma · 利根郡片品村

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Official classification

Spring type (therapeutic classes)

Simple hot spring

Official spring-type name (as recorded)単純温泉（中性低張性高温泉）

Source temperature
48°C
pH
7.5–7.65
Flow rate
300 L/min
Radon
Unconfirmed

Appearance & feel

Water colour · Feel

Clear

Colour and feel are listed only where a source states them. They vary by day and by bath.

This area has basic information only. In-depth articles are being added.

Facilities in this area

Facilities come from the register (Wikipedia, OpenStreetMap, official sites). Those marked "natural spring unconfirmed" are listed on the basis of their name only.

No facility information yet.

Getting there

Reachable by public transport

鉄道：上越新幹線上毛高原駅よりバス1時間約24分

Checked
no check date
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Visitor reviews

No reviews yet. While the review platform is being prepared, we do not display fictional reviews or ratings.

Review posting is in preparation, with visit date, facility, comments on water, scenery and access, photos, language and reporting.

Onsen areas nearby

Register sources

Data status

Name & locationPublishedCoordinatesPublishedSpring typePublishedPhotosIn preparationFacilitiesIn preparationVisiting info (dated)In preparationEditorial articleIn preparation

Updated 2026-10-09

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