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Hokuriku & Koshinetsu · Onsen area

Ōsawayama Onsen

おおさわやまおんせん · 大沢山温泉

Niigata · 南魚沼市

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Official classification

Spring type (therapeutic classes)

Official spring-type name (as recorded)ナトリウム-塩化物・炭酸水素塩

Source temperature
27.2°C
pH
8.46
Flow rate
Unconfirmed
Radon
Unconfirmed

Appearance & feel

Water colour · Feel

Unconfirmed

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

JR上越線大沢駅から約2.5 km

Checked
no check date

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.

Register sources

Data status

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

Updated 2026-10-09

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