Tennen Onsen Noten Spa Jukkai no Yu

Wakayama, Wakayama, Japan

Location: Wakayama, Wakayama, Japan
Water type: sodium chloride
Temperature: 41 °C
pH: 7.3

Water profile

Thermicity

Sedative

41 °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

Tennen Onsen Noten Spa Jukkai no Yu is a rooftop natural hot spring spa whose name — 'Noten' meaning rooftop — signals its dramatically elevated, open-air setting where bathers soak in geothermal mineral waters beneath an open sky, surrounded by panoramic views of city or landscape stretching to the horizon. The facility's name 'Jukkai no Yu' (ten floors of hot water) suggests a layered variety of bathing experiences at different temperatures and mineral concentrations, catering to guests seeking both deep relaxation and a moment of well-being. This urban onsen represents the innovative Japanese response to city density — bringing the warmth of a mountain hot spring tradition into the heart of metropolitan life, making the restorative ritual of onsen bathing available to daily commuters and urban dwellers.

Insider tip — Tennen Onsen Noten Spa Jukkai no Yu is a large urban onsen complex in Wakayama city offering natural sodium-chloride hot spring water drawn from deep underground. The facility's rooftop outdoor bath provides an unusual urban panorama over the city lights, making it especially atmospheric after dark. The salty, warming waters are well-suited to the mild but humid coastal climate of Kii Peninsula winters. The proximity to Wakayama Castle and Koyasan pilgrimage routes makes this an ideal overnight detour on the Kumano Kodo heritage trail.

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