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Marunuma Onsen
4.2★ · 82 Google ratings · Katashina, Gunma · 丸沼温泉
✓ Natural hot-spring water✓ Free-flowing source water✓ Rest area
Before you go
Can you bathe here?
Day visitors
NoDay-use bathing is offered for 1000 yen, but only within a narrow window (around 14:00-20:00 per one visit); another visitor reports being turned away every time with a posted 'no day-use bathing' sign, so hours may be inconsistently enforced or seasonal.stated on the facility's website · read 2026-09
visitors report Limited hours · 3 visitors · Jun 2024 – May 2026
visitors report Limited hours · 3 visitors · Jun 2024 – May 2026
Price
¥1,000Day-use admission is consistently reported as 1000 yen.stated by 3 visitors · May 2019 – May 2026
Tattoos
Not known · call aheadno policy stated in the 22 recent reviews we read or on the facility's website
Watch out
Day visitors
Day-use bathing is offered for 1000 yen, but only within a narrow window (around 14:00-20:00 per one visit); another visitor reports being turned away every time with a posted 'no day-use bathing' sign, so hours may be inconsistently enforced or seasonal.
stated by 3 visitors · Jun 2024 – May 2026The bath
What you’ll find
A remote, single lodge-style ryokan (environmental resort) on the shore of Lake Marunuma, with a distinctive bath overlooking a fish tank of trout and char; day-use bathing is offered but only during narrow, inconsistently-enforced afternoon hours.
Restaurant
✓ YesThe lodge serves its own meals to guests; a separate nearby teahouse is noted as not worth expecting food from.stated by 1 visitor · Oct 2018
Lodging
✓ YesThis is a single lakeside ryokan (Kankoso) offering overnight stays, priced from around 23,000 yen and up.stated by 3 visitors · Oct 2018 – Sep 2019
Guide
What visitors add
Price
Day-use bathing costs 1000 yen — stable across three reviewers from 2019 to 2026; one 2019 reviewer considers it (and the 23,000+ yen lodging) expensive enough that locals stay away, while a 2026 reviewer judges the price fair given the remote mountain location.
stated by 4 visitors · May 2019 – May 2026Day-use visits
Day-use bathing exists but is unreliable: one reviewer (June 2024) read the sign as day-use 14:00-20:00 for 1000 yen and was turned away in the morning, while another (Sept 2024) says a 'no day-use bathing today' notice was up on every one of their visits; a May 2026 reviewer did bathe as a day visitor.
stated by 3 visitors · Jun 2024 – May 2026The water
No reviewer describes the spring's chemistry; the bath's signature feature is an aquarium visible from the tub with swimming rainbow trout (and char, per the 2018 reviewer) — mentioned by two reviewers eight years apart; a third reviewer relays secondhand that the inn's bath is 'wonderful'.
stated by 3 visitors · Oct 2018 – May 2026Practical
Plan your visit
📍 4658-7 Higashiogawa, Katashina, Tone District, Gunma 378-0414
🚃 Sori station, 28.6 km
📞 +81278-58-2002
📋 Show at the counter: 丸沼温泉
Nearby
Other baths close by
Katashina · 4.1★
Katashina · 3.9★
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