No. 37 · Gunma
Manza Onsen
Manza Onsen ranked No. 37 in the published 2025 Japan hot-spring destination list. Check bathing options, access and stay details before planning your visit.
Spring information
Water and bathing details for Manza Onsen
Facility-level figures; blank town-wide averages are not inferred.
Named facility records for Manza Onsen. Figures marked “Not published” are not treated as town-wide averages.
| Facility | Spring | Source data | Supply | Bath type |
|---|---|---|---|---|
| Manza Prince Hotel (Day-Use Onsen) | Uba-yu: acidic, sulfur-bearing sodium-magnesium sulfate spring (hydrogen sulfide type; low-tonicity, acidic, high-temperature spring) Source: Komakusa-no-Yu: Uba-yu spring from the Yubatake source; some other baths in the hotel use mixed spring water | Source temperature: Uba-yu: approximately 76–80°C at the source; not the bath temperature pH: Approximately 2.5 for Uba-yu only; this is not a value for every bath | The hotel FAQ describes all 20 baths at Manza Prince Hotel and Manza Kogen Hotel as free-flowing. Uba-yu cools naturally in transit and through heat exchange; water may be added for final temperature adjustment. | Ryokan. A straightforward first stop in Manza for milky sulfur water and a high-mountain outdoor bath. If comparing several spring sources is the main goal, Manza Kogen Hotel is the better choice. |
| Manza Kogen Hotel (Day-Use Onsen) | Uba-yu is an acidic, sulfur-bearing sodium-magnesium sulfate spring (hydrogen sulfide type); the other three springs have different classifications. Source: Eight outdoor baths in the Stone Garden use four springs: Uba-yu, Daiku-yu, Ryusen-no-Yu and Tsumetori-no-Yu | Source temperature: Uba-yu, a representative source: approximately 76–80°C; not the bath temperature pH: Approximately 2.5 for Uba-yu; no matching value is established for the other springs | The Stone Garden has eight baths supplied by four springs. The hotel FAQ describes all 20 baths across Manza Kogen Hotel and Manza Prince Hotel as free-flowing. High-temperature spring water is adjusted during delivery and by heat exchange; water may also be added for final temperature control. | Ryokan. Come here to compare four spring sources without leaving the hotel. If mixed bathing is not for you, or you only want a short scenic soak, Manza Prince Hotel is easier to choose. |
Destination comparison
What this onsen town offers
History
73/100Spring character
97/100Town culture
74/100Seasonal scenery
75/100Access
69/100Local history
How the town developed
Four seasons
Seasonal conditions and travel rhythm
Plan your stay
Manza Onsen: day trip or overnight?
Compare travel time, bath access and the time you want to spend in town.
Day trip
Check the first and last transport connections, then confirm which baths accept day visitors and when they stop admitting guests.
Manza Kogen Hotel: Stone Garden Baths, Rooms and AccessOne-night stay
Compare the ryokan’s bath access with public day-use options and the journey back to your next stop.
Where to Stay for a Snow-View Open-Air Onsen in JapanStay plus a day bath
Choose one bath experience for your stay and use a day facility for a different source or setting, where the published details support it.
Manza Kogen Hotel: Stone Garden Baths, Rooms and AccessNearby destinations
Other places in the same prefecture in the published ranking.
Related guides
Guides to Manza Onsen
Filter English guides by the question you need to answer.
Destinations & itinerariesWhich Gunma Onsen Should You Choose? Kusatsu, Ikaho, Shima, Minakami and Manza
Compare Gunma’s onsen areas: Kusatsu’s walkable town, Ikaho’s steps, Shima’s valley, Minakami’s wide region and high-altitude Manza.
Read the guideComparisonsManza Onsen Day Trip or Overnight Stay? Plan Around the Bus Window
Compare Manza’s day-bath cutoffs (3 p.m. at Prince, 5 p.m. at Kogen) with the longer stay: guests at either can use both hotels’ baths until midnight.
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Destinations & itinerariesManza Onsen by Season: Road Closures, Colours and Bathing Plans
Find the right season for Manza Onsen and plan around high-altitude weather, autumn colours, winter road closures, bus changes and hotel opening dates.
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Getting thereManza Kogen Hotel: Stone Garden Baths, Rooms and Access
Plan a stay at Manza Kogen Hotel with a clear look at its four-source Stone Garden baths, shared-pool rules, sister-hotel access and seasonal transport.
Read the guideDestinations & itinerariesA One-Night Plan for Manza Onsen
Plan one night in Manza Onsen around the mountain bus, check-in, two unhurried bathing sessions and a flexible route back down.
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Getting thereHow to Get to Manza Onsen: Trains, Buses and Mountain Roads
Reach Manza by train and seasonal bus from Karuizawa or via Naganohara-Kusatsuguchi. Winter roads and the final mountain transfer affect each route.
Read the guideGetting thereStaying at Manza Prince Hotel: Onsen, Rooms and Access
Plan a Manza Prince Hotel stay with sulfur baths, room choices, winter access and bathing at sister hotel Manza Kogen; check transport for the mountain road.
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ComparisonsManza Prince vs. Manza Kogen: Which Onsen Works Better for a Day Trip?
Compare Manza Prince and Manza Kogen for a day bath by hours, gender-separated or mixed pools, private-bath access and return transport.
Read the guideComparisonsManza or Kusatsu Onsen? Choose Between a Mountain Retreat and a Walkable Town
Compare walkable Kusatsu with remote, high-altitude Manza, including day-bath hours, bus access and winter travel considerations in Gunma.
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Ryokan staysWhere to Stay for a Snow-View Open-Air Onsen in Japan
Compare snow-view baths at Manza Kogen, Zao Kokusai and Naruko’s Yumoto Kissho, from mixed-gender outdoor pools to four free private baths and winter access.
Read the guideOfficial sources
