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Kuromatsunai Onsen; Buna no Mori (Reopened)

Kuromatsunai, Hokkaido, Japan
Kuromatsunai Onsen; Buna no Mori (Reopened)
Location
Kuromatsunai, Hokkaido, Japan
Water type
thermal, sodium chloride
Temperature
40 °C
pH
7.3

Water profile

Thermicity
Sedative
40 °C
LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation
Restorative
LowHigh

Loaded with major ions — the essential minerals (Ca, Mg).

Buoyancy
Effortless float
LowHigh

Dense, salty water — you float without effort.

SodiumChloruresBrome

Kuromatsunai Onsen (Buna no Mori), recently reopened, is located in Kuromatsunai, southern Hokkaido, Japan. Its sodium-chloride thermal water reaches around 40°C. The bathhouse offers an indoor bath, an outdoor rotenburo bath and a sauna.

Insider tip — 'Buna no Mori' (beech forest) Onsen in Kuromatsunai-cho — the town is home to the northernmost natural beech forest in Japan, a protected botanical rarity. The reopened onsen (note: 'Reopened' in the name) offers a warm soak after exploring the ancient buna trees of this UNESCO-adjacent landscape.
Find hotels nearby →Tickets & activities →See the map & practical info →

Nearby

Kuromatsunai Onsen
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Kinkatou
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Oshamambe Onsen
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Oshamambe Onsen Hokkaido
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Frequently asked questions

How hot is the water?
The water runs quite hot here, around 40 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features thermal & sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.