Right Onsen › Tokyo › Baths fed straight from the source, not recirculated
Free-flowing (kakenagashi) onsen in Tokyo
17 baths in Tokyo. 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.
Itabashi City · The main spring bath is served kakenagashi-style, without recirculation, according to multiple visitors (2026).
Price: ¥970 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesKodaira · Two 2026-03 reviews describe the hot spring water as source-fed kakenagashi (heated only), while another 2026-03 review describes it as heated and recirculated.
Day visitors: Yes · Outdoor bath: Yes · Sauna: Yes · Tattoos: Not allowedMachida · The outdoor bath is explicitly described as source-fed (kakenagashi) hot spring water.
Price: ¥880 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesOta City · The black spring water bath is run on a source-fed (kakenagashi) basis, though it is heated before use.
Day visitors: Yes · Sauna: Yes · Payment: Cash onlyOshima · Several reviews from 2026-01 to 2026-04 describe the spring as genuine source-fed (kake-nagashi).
Price: ¥800 · Day visitors: Yes · Outdoor bath: YesSetagaya City · The cold mineral bath is repeatedly described as kakenagashi (source-fed, non-recirculated).
Price: ¥600 · Day visitors: Yes · Outdoor bath: No · Sauna: YesOta City · The black-water spring is described as 100% natural source water with no added tap water, reported as kakenagashi.
Price: ¥550 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesOshima · Two reviews describe the water as 100% source-fed and flow-through (kakenagashi).
Price: ¥300 · Day visitors: Yes · Outdoor bath: YesOta City · Reviewers described the outdoor bath and cold plunge as source-fed (kakenagashi), drawn directly from the spring.
Price: ¥550 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesHachijo Town · Reviewers describe the bath as fully source-fed (kakenagashi) with continuous natural flow.
Price: Free · Day visitors: YesNiijima · The spring flows naturally from the source with no recirculation, mixing directly with seawater as the tide changes.
Price: Free · Day visitors: Yes · Outdoor bath: YesKita City · The cold well-water bath is described as flow-through (kakenagashi) rather than recirculated, in reviews from 2023 to 2025.
Day visitors: Yes · Sauna: NoOta City · The cold black-water plunge tub is fed by source water on a flow-through (kakenagashi) basis.
Day visitors: Yes · Outdoor bath: No · Sauna: NoNiijima · Reviewers describe the water as source hot-spring flow-through (kakenagashi) in 2024.
Price: ¥300 · Day visitors: Yes · Outdoor bath: Yes · Sauna: YesEdogawa City · Reviewers from 2022 to 2025 describe the groundwater-fed baths as flow-through (kakenagashi) rather than recirculated.
Day visitors: Yes · Sauna: NoNiijima · The hot water self-flows naturally from beneath the seabed, described as a natural source rather than recirculated.
Price: Free · Day visitors: Yes · Outdoor bath: YesNiijima · The spring water self-fountains directly from the seabed rocks with no recirculation or added water, as described in 2022 and 2025 reviews.
Price: Free · Day visitors: Yes · Outdoor bath: YesAlso in Tokyo
