Right Onsen › Gunma › Minakami
Sanazawa Terrace
4.3★ · 142 Google ratings · Minakami, Gunma · さなざわ㞢テラス（温泉＆サウナ）
Before you go
Can you bathe here?
Day visitors
✓ YesRepeatedly confirmed as open to day-trip bathers alongside its lodging operation.stated on the facility's website · read 2026-09
visitors report Yes · 6 visitors · Nov 2024 – Jun 2026
visitors report Yes · 6 visitors · Nov 2024 – Jun 2026
Tattoos
Not known · call aheadno policy stated in the 33 recent reviews we read or on the facility's website
Watch out
Lockers
Free valuables lockers are reported, though undersized, and one visitor found only open baskets with no lockers at all.
stated by 2 visitors · Jan 2025 – Feb 2026The bath
What you’ll find
A hillside ryokan-style onsen overlooking rice terraces, with strongly alkaline metasilicic-acid water, indoor and outdoor baths, a reservation-based wood-fired sauna, a cafe/rest area, and overnight lodging, though several reviewers complain of cramped changing rooms and inconsistent staff and booking availability.
Outdoor bath
✓ YesAn outdoor bath overlooking the rice terraces is repeatedly described.stated by 5 visitors · Jul 2024 – Feb 2026
Indoor baths
1One detailed review confirms a single indoor bath alongside the outdoor one.stated by 1 visitor · Feb 2026
Sauna
✓ YesA paid, wood-fired sauna is confirmed by most reviewers, though one visitor reported no sauna at all.stated by 7 visitors · Aug 2024 – May 2026
View
MountainPerched on a mountainside, the outdoor bath overlooks terraced rice fields.stated by 3 visitors · Feb 2026 – Oct 2025
Rest area
✓ YesA spacious tatami rest area with kotatsu tables is repeatedly praised.stated by 4 visitors · Jan 2026 – May 2026
Restaurant
✓ YesA small cafe serves homemade muffins, apple juice, and lemon water alongside the rest area.stated by 3 visitors · Jul 2025 – Feb 2026
The water
Spring type
Strongly alkaline, metasilicic acid springDescribed as a strongly alkaline metasilicic-acid spring prized for silky-smooth skin effects.stated by 2 visitors · Jan 2025 – Apr 2026
pH
pH 9.6One reviewer cites a measured pH of 9.6.stated by 1 visitor · Jan 2025
Practical
What to bring
Lockers
✓ FreeFree valuables lockers are reported, though undersized, and one visitor found only open baskets with no lockers at all.stated by 2 visitors · Jan 2025 – Feb 2026
Hair dryer
✓ YesMultiple free hair dryers are available in the changing room.stated by 3 visitors · Jan 2025 – Jul 2025
Guide
What visitors add
The water
The water is strongly alkaline, colorless, and noticeably slippery/smooth on the skin ('beauty bath' type); at least eight reviewers describe the slippery or skin-smoothing feel, and one gives a pH of 9.6 with metasilicic acid.
stated by 8 visitors · Jun 2024 – May 2026Staffing
The facility is staffed (reception desk), but service reviews conflict: three reviewers praise the staff (kind, good service, well-attended facility) while three others complain (staff chatting instead of managing an overcrowded day, 'terrible attitude', and a weak response to a guest using a phone in the bath). Phone contact reaches an automated system only, per one reviewer.
stated by 7 visitors · Jul 2024 – May 2026Day-use visits
Day-trip (higaeri) bathing is offered: at least six reviewers describe visiting for day-use only. No opening hours are stated in reviews. Caution: one reviewer (May 2026, Golden Week) was unable to bathe because the changing room was over capacity and got no refund, and another (June 2026) also asks for visitor caps at busy times.
stated by 6 visitors · Jul 2024 – Jun 2026Towels, soap & lockers
Clothes go in baskets (one reviewer counted about 10) and there is a free but small valuables locker: one reviewer says the valuables box is cramped, one says 'baskets only, watch your valuables', one says the valuables locker and dryer are free. One reviewer (June 2026) reported their locker contents had been moved by another guest. The changing room itself is small; two reviewers complain it has no air conditioning and is sweltering in summer.
stated by 6 visitors · Jan 2025 – Jun 2026Outdoor bath & sauna
There is an indoor bath and a small open-air bath (rotenburo) with a view over terraced rice fields; at least five reviewers mention the rotenburo and three specifically praise the view from it.
stated by 5 visitors · Nov 2024 – Apr 2026Outdoor bath & sauna
There is a wood-fired sauna, but it is a paid extra rather than included with bathing: one reviewer says the sauna costs extra, another says it is reservation-only private use, and a third (May 2026) warns the wood sauna is slow to heat and very smoky until the wood burns down. One reviewer who came only for the baths says there is 'no sauna', consistent with it not being part of regular admission.
stated by 5 visitors · Jan 2025 – May 2026Practical
Plan your visit
📍 2537-2 Tsukiyono, Minakami, Tone District, Gunma 379-1313
🚃 Jomo-Kogen station, 1.8 km
📞 +8150-1807-3582
📋 Show at the counter: さなざわ㞢テラス（温泉＆サウナ）
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