What type of hot spring is Sengokuharaonsen Senkyourou?

Sengokuharaonsen Senkyourou is classified as "酸性－カルシウム－硫酸塩・塩化物温泉" (酸性泉, 硫酸塩泉, 塩化物泉 spring type).

What is the pH of Sengokuharaonsen Senkyourou?

Sengokuharaonsen Senkyourou (Owakudani Onsen Steam-induced Mixed Spring) has a pH of 2.1. It is strongly acidic with high antimicrobial properties.

Does Sengokuharaonsen Senkyourou have beauty benefits for skin?

Yes. Sengokuharaonsen Senkyourou contains 157mg/kg of metasilicic acid, exceeding the 50mg/kg beauty spring standard. It helps improve skin texture and moisture retention.

Is Sengokuharaonsen Senkyourou a natural flow hot spring?

Sengokuharaonsen Senkyourou is a natural flow spring, unheated, undiluted, non-recycled.

Image: Agoda

PR · Agoda

Sengokuharaonsen Senkyourou

仙郷楼

Verified

Kanagawa Hakone

神奈川県箱根町

Onsen RyokanFree-Flowing Onsen

AT A GLANCE

Sengokuharaonsen Senkyourou is an acidic spring, sulfate spring, and chloride spring (pH 2.1, acidic). Naturally flowing (no recycling or dilution). Contains ≥50 mg/kg of metasilicic acid, certified as a beauty spring. Per Japan's Ministry of the Environment guidelines, indicated for atopic dermatitis and psoriasis.

SOURCES

♨Owakudani Onsen Steam-induced Mixed Spring

大涌谷温泉蒸気造成混合泉

Acidic Calcium Sulfate and Chloride Hot Spring

Chloride SpringpH 2.160.6℃造成温泉（蒸気造成混…

See effects, components & details

How Long to Stay (Toji)

Start with 2 nights / 3 days

Japan’s Ministry of the Environment notes that even a short stay refreshes you. For a full therapeutic cure, around 2–3 weeks is the guideline.

Sengokuharaonsen Senkyourou

From¥26,600/ person / night (tax incl.)

4.6(364)

Approx. lowest rate (varies by date & guests)

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USAGE

Free-Flowing Onsen

Pure spring water — no dilution, no recirculation

HeatedNo

DilutedNo

RecycledNo

FilteredNo

DisinfectedNo

AdditivesNo

▸Note

The temperature, pH and component values shown here are based on the hot spring analysis (source). Actual values in the bath may differ depending on heating, dilution, recycling and filtration. Please check current usage status at the facility.

FACILITY INFO

Official site

Private bath (Kashikiri)

Available

Room with private open-air bath

Available

About tattoos and onsen

Travelers with tattoos can still bathe comfortably in a private bath (Kashikiri) or a room with a private open-air bath.

Hours

Weekdays: 00:00〜24:00

Weekends & holidays: 00:00〜24:00

Public baths are available 24 hours. Private open-air baths are available from 5:00 to 24:00.

Closed days: Open all year round

Transit

From Hakone-Yumoto Station (箱根湯本駅), take the Hakone Tozan Bus (for Togendai (桃源台)) for approx. 25-30 minutes, get off at 'Sengokuro-mae' (仙郷楼前) bus stop. Approx. 15-20 minutes by car from Tomei Gotemba IC (東名御殿場IC).

Parking

Available, 80 spaces, Free

Phone

0460-84-8521

Facilities

Public BathOpen-air BathPrivate BathIn-room Open-air BathGift ShopVending MachinesBanquet HallConference Room

House rules

Mixed-gender bathing in the public bath is restricted for individuals aged 7 and above, according to Kanagawa Prefecture (神奈川県) ordinance.

Sources

楽天じゃらん ryokan.or.jp 公式楽天 mapion.co.jp jtb.co.jp hakone.or.jp

This information may change without notice. Please contact the facility directly for accurate details.

Last updated: 6/1/2026

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✨ The descriptions, catch phrases, and translations on this page are generated by AI (Claude). pH, temperature, and component values are OCR-extracted from the official analysis report. Learn more