Right Onsen › Gunma › Baths fed straight from the source, not recirculated
Free-flowing (kakenagashi) onsen in Gunma
48 baths in Gunma. Gensen kakenagashi means spring water flows through the bath and out again, rather than being filtered and returned. Where reviewers disagree, the bath is listed as partly free-flowing on its own page instead of here.
Kusatsu · All the baths run on genuine kakenagashi Kusatsu spring water.
Price: ¥1,200 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesNumata · Widely described as source-fed kakenagashi (except the cold bath), including one explicit '100%' claim.
Price: ¥800 · Outdoor bath: Yes · Sauna: YesShibukawa · The outdoor bath is fed by natural kakenagashi source water, per two reviewers.
Price: ¥700 · Outdoor bath: Yes · Sauna: YesShibukawa · The facility is marketed and generally experienced as kakenagashi, though staff have separately confirmed chlorine is also added to the bath.
Outdoor bath: Yes · Sauna: Yes · Tattoos: AllowedMinakami · Two reviewers describe the baths as fully source-fed (kakenagashi), no recirculation mentioned.
Price: ¥900 · Day visitors: Yes · Outdoor bath: Yes · Sauna: NoTakasaki · The spring water is confirmed kakenagashi (free-flowing), per two reviewers.
Price: ¥800 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesTakasaki · Multiple reviewers confirm every bath, indoor and outdoor, runs on true kakenagashi spring water with no recirculation.
Price: ¥1,000 · Outdoor bath: Yes · Sauna: YesNakanojo · Confirmed as source-fed kakenagashi water.
Price: ¥600 · Day visitors: Yes · Outdoor bath: YesMinakami · Two of the three source baths were genuine flow-through kakenagashi.
Price: ¥630 · Day visitors: No · Outdoor bath: YesMaebashi · Widely and repeatedly confirmed as a genuine kakenagashi (source-fed, flow-through) natural hot spring, unusual for a station-front super-sento.
Price: ¥1,000 · Outdoor bath: Yes · Sauna: YesNaganohara · Genuine kakenagashi source-fed water confirmed by five reviewers, though water is diluted since the source runs hot; one 2026-08 reviewer also found hair and skin debris in the water, questioning freshness on a busy day.
Price: ¥500 · Day visitors: Yes · Outdoor bath: Yes · Sauna: NoKusatsu · Water runs straight from the source with no washing stations, kakenagashi style.
Price: Free · Day visitors: YesTakasaki · The outdoor spring-fed tub is signed as kakenagashi natural spring water.
Price: ¥800 · Outdoor bath: Yes · Sauna: YesMinakami · A kakenagashi spring-fed cold plunge bath (around 30C) is a distinctive feature.
Outdoor bath: Yes · Sauna: YesShibukawa · The bath runs on a genuine kakenagashi (free-flowing) iron-rich spring, heated but not diluted or recirculated.
Price: ¥500 · Outdoor bath: YesKatashina · Consistently and heavily documented as true kakenagashi with visible overflow, not recirculated.
Price: ¥1,000 · Outdoor bath: Yes · Payment: Cash onlyNakanojo · Genuine source-fed flow-through hot spring.
Price: ¥300 · Outdoor bath: NoKusatsu · Fresh acidic source water pours continuously from the tap into the tub.
Price: Free · Day visitors: Yes · Outdoor bath: NoNaganohara · Consistently described as genuine kakenagashi with abundant, undiluted source flow into both baths.
Price: ¥1,000 · Day visitors: Yes · Outdoor bath: Yes · Payment: Cash onlyKusatsu · 100% source-fed flow-through bath just meters from the spring itself.
Price: Free · Day visitors: Yes · Outdoor bath: No · Sauna: NoNakanojo · The bath is fed by kakenagashi free-flowing source water, confirmed by multiple reviewers.
Price: Free · Day visitors: Limited hoursMinakami · Genuinely source-fed (kakenagashi), with no added water and no artificial heating.
Price: ¥400 · Outdoor bath: Yes · Sauna: NoHigashiagatsuma · Most reviewers describe the bath as source-fed flow-through (kakenagashi), though two reviews explicitly mention added/circulated water, so the practice may not be uniform across all tubs or days.
Price: ¥600 · Day visitors: Yes · Outdoor bath: Yes · Sauna: NoMinakami · Consistently confirmed as genuine, self-flowing kakenagashi water with visible overflow.
Price: ¥350 · Day visitors: Yes · Outdoor bath: NoNakanojo · Repeatedly confirmed as genuine kakenagashi with continuously overflowing source water and no added water.
Price: Free · Day visitors: Yes · Outdoor bath: NoTsumagoi · The overwhelming majority of reviewers describe the water as genuine, unaltered source-fed kakenagashi.
Price: ¥600 · Day visitors: Yes · Outdoor bath: YesHigashiagatsuma · Water is genuinely 100% source-fed (kakenagashi), repeatedly confirmed.
Price: ¥400 · Day visitors: Limited hours · Outdoor bath: Yes利根郡みなかみ町 · Reviewers describe the bath as fully source-fed with no recirculation or water dilution, though it is heated.
Price: ¥1,500 · Day visitors: Yes · Outdoor bath: No · Sauna: YesNumata · Multiple reviewers, including a detailed one citing pH, confirm the spring is kakenagashi.
Price: ¥1,000 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesKusatsu · Genuine kakenagashi water direct from the Bandaiko source.
Price: Free · Day visitors: Limited hoursMinakami · The bath is fed by genuine kakenagashi (free-flowing) source water, confirmed extensively by reviewers.
Price: ¥300 · Day visitors: Yes · Outdoor bath: No · Payment: Cash onlyNakanojo · Consistently described as true kakenagashi source-fed water; bathers can add cold water via a hose to cool it when it runs too hot.
Price: FreeMinakami · The baths are fed by natural kakenagashi (free-flowing) source water, confirmed by multiple reviewers.
Day visitors: Yes · Outdoor bath: YesKusatsu · Confirmed genuine kakenagashi source-fed flow from the Yubatake source by two detailed reviewers.
Price: Free · Day visitors: YesKusatsu · The bath is fed directly and continuously from the Yubatake source (kakenagashi).
Price: Free · Day visitors: Limited hours · Outdoor bath: NoMinakami · Five reviewers across 2019-2026 consistently describe the water as genuine kakenagashi source-fed flow.
Price: ¥800 · Day visitors: Yes · Outdoor bath: YesKatashina · The spring is repeatedly certified/described as 100% kakenagashi with no heating, added water, or recirculation.
Price: ¥750 · Day visitors: Limited hours · Outdoor bath: Yes · Sauna: NoMinakami · Described as genuine kakenagashi source-fed water by two reviewers.
Price: ¥500 · Day visitors: Yes · Outdoor bath: No · Sauna: NoMinakami · Water bubbles directly up from the floor of the bath, true source-fed kakenagashi with no piping.
Price: ¥1,500 · Day visitors: YesKusatsu · The bath is genuine, complete flow-through spring water direct from the Yubatake source.
Price: Free · Day visitors: Local residents onlyNakanojo · Multiple reviewers, including one citing staff, describe the water as genuine kakenagashi (source-fed, overflowing).
Price: ¥500 · Day visitors: Yes · Outdoor bath: No · Sauna: NoMinakami · The bath runs on free-flowing (kakenagashi) spring water, confirmed by multiple reviewers.
Price: ¥200 · Day visitors: Limited hours · Payment: Cash onlyNakanojo · The bath is fed by complete kakenagashi (free-flowing) source water from Shiriyaki Onsen, per multiple reviewers.
Price: ¥400 · Day visitors: No · Outdoor bath: NoKusatsu · The bath is fed straight from the Yubatake source via a hose/tap, with temperature adjusted only by throttling the source flow rate rather than heating or diluting it.
Price: Free · Day visitors: Local residents onlyMinakami · Multiple reviewers confirm true source-fed flow-through with water constantly overflowing the tub.
Price: ¥400 · Day visitors: Limited hours · Payment: Cash onlyTsumagoi · Source-fed flow-through bath.
Price: ¥600 · Outdoor bath: NoMinakami · Water flows directly from the source tank with no dilution or added heating.
Day visitors: Staying guests onlyMinakami · The spring bubbles up directly through the stones of the tub floor -- a genuine foot-source flow-through bath.
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