Akita · Tamagawa Onsen
Shin-Tamagawa Onsen
新玉川温泉
A modern cure-bath inn fed by Tamagawa Onsen, Japan's most acidic spring at pH 1.2. The hiba-cypress bathhouse lines up 15 tubs — 100% source, 50% diluted, mildly acidic and more — so you can choose by condition. Day use 10:00–15:00, ¥1,000 (revised April 2026). An indoor stone-slab bath (¥800) is also available, and unlike the original Tamagawa it stays open all winter for snowbound soaking. About 70 min by bus from Tazawako Station.
- Price (adult)
- ¥1,000
- Hours
- 10:00–15:00
- Closed
- Open daily (occasional closures)
- Access
- About 70 min by Ugo Kotsu bus from JR Tazawako Station to Shin-Tamagawa Onsen; 110 min by car from Morioka IC
- Water type
- Acidic spring
- Tattoos
- Ask ahead
- Phone
- 0187-58-3000
- Official site
- www.shintamagawa.jp/care ↗
- Open in Google Maps
- Google Maps ↗
Essentials
Stay in this onsen town
Compare and book stays in Tamagawa Onsen. Day bathing itself needs no booking.
Opens partner booking site (affiliate)
Why go
- Japan's most acidic spring, pH 1.2
- 15 tubs graded by source strength
- Open in winter (the original inn closes)
Before you go
- No official tattoo policy is published — ask at reception.
- Strongly acidic water — rinse off afterwards, avoid long soaks, and remove silver jewellery.
- Ryokan day-use hours are limited and may be suspended in peak season — phone the same morning.
- Last entry is 30–60 minutes before closing.
Features
Sauna & wellness
Price
Who with
Convenience
Mood & scenery
Amenities
✔ Verified operating: 2026-09 公式サイト（日帰り10:00–15:00 受付14:30・大人1,000円 2026/4/1改定・岩盤浴800円）
Prices and hours change. Check official sources before visiting.
More in this area
Tsurunoyu Onsen
The oldest inn in the Nyuto Onsen area, a hidden hot spring dating to the Edo period. The thatched 'Honjin' building and the large milky-white mixed rotenburo are its iconic scene. Day bathing 10:00–15:00; on Mondays the rotenburo is closed for cleaning and only indoor baths are open. Rooms sell out months ahead. From Tazawako Station take the bus, then the inn shuttle from Alpa Komakusa.
Kuroyu Onsen (Nyūtō)
The innermost of Nyūtō's seven baths — a cluster of thatched bath huts. Two separate sources feed a mixed open-air pool and gender-separated indoor/outdoor baths of milky sulfur water. Day use 9 am–4 pm, the longest window of the seven; closed mid-November to mid-April.
Nyūtō Onsen Tae-no-yu
The most polished of the seven Nyūtō inns, beside the Sendatsu stream and popular with women. Two sources — rusty 'gold' and clear 'silver' — in open-air baths above the rushing river. Day-use reception is short (10:30 am–2 pm), so come early.