Shonai Onsen Suiden Terrasse

Shonai, Tsuruoka, Yamagata Prefecture, Japan

Location: Shonai, Tsuruoka, Yamagata Prefecture, Japan
Water type: bicarbonate
Temperature: 41 °C
pH: 8

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

Standard buoyancy

LowHigh

Soft water — natural, classic buoyancy.

BicarbonatesSodiumCalcium

Shonai Onsen Suiden Terrasse is an architecturally celebrated ryokan resort in Tsuruoka, Yamagata Prefecture, designed by Kengo Kuma to float above the rice paddies of the Shonai plain like a mirrored reflection of the sky in its glass-and-timber structure. The bicarbonate thermal waters of the onsen are valued for their skin-smoothing alkaline properties and their calming effect on the nervous system, elevating the restorative bathing experience within this award-winning contemporary architectural setting. Surrounded by the agricultural traditions of one of Japan's finest rice-growing regions and situated near the Dewa Sanzan sacred mountains, Suiden Terrasse combines modern design, culinary excellence, and ancient geothermal bathing in a single exceptional destination.

Insider tip — Shonai Onsen Suiden Terrasse is an architecturally celebrated resort designed by Kengo Kuma that rises from the paddy fields of the Shonai plain, its timber lattice facade reflecting in the surrounding rice terraces. The bicarbonate spring water at 41°C is piped from the volcanic highlands and flows into both indoor galleries and outdoor infinity pools that dissolve into the agricultural landscape. Visit during the June transplanting season when the rice paddies fill with water and the mirrored fields stretch to the Dewa Mountains.

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