Right Onsen › Gunma › Baths fed straight from the source, not recirculated
Free-flowing (kakenagashi) onsen in Gunma
53 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 · Two reviewers from August and July 2026 confirm all baths use source 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 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesShibukawa · Hot-spring source water flowing directly in outdoor bath and heated bath feature; tsutae-yu (cascade bath) with raw source water at very high temperature also present.
Price: ¥850 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesShibukawa · Golden hot spring water flows directly (kakenagashi) into the main bath; visitors noted it leaves a dark mud-like residue and recommend showering afterwards.
Day visitors: Yes · Outdoor bath: Yes · Sauna: Yes · Tattoos: Private bath onlyMinakami · Explicitly stated as source-fed flowing bath (all baths sourced from spring).
Price: ¥900 · Day visitors: Yes · Outdoor bath: YesKusatsu · Visitors confirm the baths use fresh spring water flowing directly from the source.
Price: ¥900 · Day visitors: Yes · Outdoor bath: No · 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 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesNakanojo · Water is sourced spring-fed (kakenagashi / flowing spring water) with no recirculation.
Price: ¥600 · Day visitors: 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 · Day visitors: Yes · 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 · Source-fed bath confirmed; source spring is visible and very close to the bath.
Price: Free · Day visitors: Yes · Outdoor bath: YesKusatsu · Reviews state the bath uses 100% unmodified source water from Shirohata spring with no temperature reduction or recirculation.
Price: Free · Day visitors: Yes · Outdoor bath: NoShibukawa · One 2026-08 reviewer states source spring water is used; another 2026-04 reviewer believed it was hot-spring pass-through but found chlorine was added.
Price: ¥800 · Day visitors: Yes · Outdoor bath: No · Sauna: NoTakasaki · The outdoor spring-fed tub is signed as kakenagashi natural spring water.
Price: ¥800 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesMinakami · Spring-fed pool explicitly described as (no recirculation); cold pool is this type.
Price: ¥700 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesShibukawa · Reviews confirm source water flows through without recirculation; source is heated 9–10°C and flows continuously.
Price: ¥500 · Day visitors: YesKatashina · Consistently and heavily documented as true kakenagashi with visible overflow, not recirculated.
Price: ¥1,000 · Day visitors: Yes · Outdoor bath: Yes · Payment: Cash onlyNakanojo · Explicitly described as source water flowing in multiple reviews; water continuously cascades.
Price: ¥300 · Day visitors: Yes · Outdoor bath: NoKusatsu · Reviews describe continuous hot spring flow from tap; no recirculation mentioned.
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 · Multiple reviews confirm 100% source-fed flowing bath with no recirculation; source lies immediately adjacent.
Price: Free · Day visitors: YesNakanojo · Multiple visitors confirm source spring flowing constantly, no recirculation (2026–2026).
Price: Free · Day visitors: Limited hours · Payment: Cash onlyMinakami · Multiple reviews explicitly state source water flows without heating or water addition.
Price: ¥400 · Day visitors: YesHigashiagatsuma · 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 · Source water flows freely; overflow visible at the bath outlet per multiple visitors.
Price: ¥350 · Day visitors: Yes · Outdoor bath: NoNakanojo · Explicitly stated as source-fed spring water (kakenagashi) by multiple reviews 2026–2025, with water continuously overflowing from the tub.
Price: Free · Day visitors: Yes · Outdoor bath: NoTsumagoi · Multiple reviews explicitly confirm pure hot-spring water flowing continuously with no added water, heating, or recirculation.
Price: ¥600 · Day visitors: Yes · Payment: Cash onlyHigashiagatsuma · Water is genuinely 100% source-fed (kakenagashi), repeatedly confirmed.
Price: ¥400 · Day visitors: Limited hours · Outdoor bath: YesMinakami · Spring water flows without recirculation or added water; heating is added to the main bath only.
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: YesMinakami · The spring water is described as flowing and transparent in 2025.
Price: ¥1,000 · Day visitors: Yes · Outdoor bath: YesKusatsu · Bandaiko source flows directly without recirculation.
Price: Free · Day visitors: Limited hours · Outdoor bath: NoNakanojo · Hot spring water flows directly from the source without recirculation (2023–2026).
Price: ¥500 · Day visitors: Yes · Outdoor bath: No · Payment: Cash onlyMinakami · Consistently described as source-fed in reviews from 2023–2026.
Price: ¥300 · Day visitors: Yes · Outdoor bath: No · Payment: Cash onlyNakanojo · Explicitly stated as source-flowing bath, not recirculated.
Day visitors: Yes · Outdoor bath: No · Payment: Cash onlyAgatsuma · Multiple guests (2024-2026) describe the indoor bath as naturally source-fed kakenagashi, though it is also diluted with added water.
Price: ¥500 · Day visitors: Yes · Outdoor bath: YesKusatsu · Several reviews (2022-2025) describe the water as free-flowing source water, continuously overflowing.
Day visitors: YesMinakami · Multiple visitors explicitly noted natural flowing hot spring water.
Price: ¥7,000 · Day visitors: Yes · Outdoor bath: YesKusatsu · Reviewers explicitly state the bath is fed by flowing hot spring source; water overflows visibly from the tub.
Price: Free · Day visitors: Yes · Outdoor bath: NoMinakami · Reviews from 2026, 2025, 2024, 2020, 2020, 2019 explicitly state 100% natural source flow; multiple confirm constant hot-water supply.
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: NoKusatsu · Reviews confirm source water flows continuously (kakeflow) from Nishi-no-Kawarahara spring.
Price: Free · Day visitors: Local residents only · Outdoor bath: NoNakanojo · Source water flows directly without recirculation; one 2020 review confirms no chlorine or recirculation at the new location.
Price: ¥100 · Outdoor bath: No · Payment: Cash onlyMinakami · Source-fed flowing water (no recirculation) explicitly stated in reviews from 2026.
Price: ¥500 · Day visitors: Yes · Outdoor bath: No · Sauna: NoMinakami · Spring flows directly from the floor without pipes or recirculation, as confirmed by multiple recent reviews (2022–2026).
Price: ¥1,500 · Day visitors: Yes · Outdoor bath: YesKusatsu · Source water flows continuously without recirculation.
Price: Free · Day visitors: Local residents onlyNakanojo · Abundant overflow with hot spring from Shiriyaki Onsen source; source temp ~50°C, facility temp 43–45°C.
Price: ¥500 · Day visitors: Yes · Outdoor bath: No · Sauna: NoMinakami · Free-flowing hot spring water; bathers scoop water from the bath with a bucket or ladle.
Price: ¥200 · Day visitors: Yes · Payment: Cash onlyNakanojo · Source-fed flowing bath (kakenagashi) at Shiriyaki spring confirmed 2016–2017.
Price: ¥400Minakami · Source water flows continuously into the bath and overflows; source temperature 55°C.
Price: ¥400 · Day visitors: Yes · Payment: Cash onlyTsumagoi · Water is sourced from a natural spring and runs over; also noted as heated in one review.
Price: ¥600 · Day visitors: Yes · Outdoor bath: NoKusatsu · Yubatake source 100% flowing bath (no recirculation) with acid sulfur-aluminum-sulfate-chloride mineral composition.
Price: Free · Day visitors: Limited hoursAlso in Gunma
