Nakoso Onsen; Seki no Yu
Nakoso, Fukushima, Japan
- Location
- Nakoso, Fukushima, Japan
- Water type
- sodium chloride
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Thermicity
Sedative
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
Nakoso Onsen, Seki no Yu, is located in Nakoso, Fukushima prefecture, Japan. Its sodium-chloride water, at 41°C, fills an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Nakoso Onsen Seki no Yu sits at the historic Nakoso Barrier, one of ancient Japan's storied checkpoint passes where poems about parting were composed by Heian-period travellers. The coastal sodium-chloride water draws on Pacific-influenced geology and is deeply warming after exploring the windswept cliffside scenery. The onsen's atmospheric name — 'barrier's hot water' — evokes centuries of weary travellers who bathed here before and after the ancient checkpoint. The Pacific Ocean is visible from the outdoor bath on clear days.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).