Day use is a dinner-inclusive plan ("Yamato Yuzen"), not a bathing-only ticket: check-in at 14:00, departure by around 21:30, roughly 14,300 to 15,400 yen per person including tax. A 150 yen bathing tax applies on top if you use the baths.
Bathing & Water
Natural onsen water
Uses natural hot spring water
Outdoor BathYes
Open-air outdoor bath
Indoor BathYes
Enclosed indoor bathing area
SaunaYes
Sauna room of any kind
Cold BathNo
Cold water plunge bath, typically used after sauna
Bathing Arrangements
Private BathYes
A private bath you can reserve for yourself or your group
Private cypress bath "Suzume no Yu" is normally 1,650 yen for a 50-minute reserved slot; complimentary as an official-website booking perk.
Room OnsenYes
Private onsen bath in guest rooms, for overnight guests only
Mixed BathingNo
Shared bathing area for all genders
Policies & Services
TattooWith Conditions
Allows entry with visible tattoos
Tattoos (including fashion tattoos) are not permitted in the large communal bath or outdoor bath; private/room baths remain available.
KidsWith Conditions
Welcomes children and families
A child may bathe in the opposite-gender large communal bath with a guardian only up to age 6.
ParkingYes
On-site or nearby parking available
Water treatment
Treated and recirculated
from Article 18 disclosure
Added water
Yes
Reheated
No
Recirculated
No
Disinfected
Yes
塩素系薬剤
Bath additives
No
湯
岡173号・鎌田41号・岡277号 地下貯湯槽混合泉
Oka No. 173 / Kamata No. 41 / Oka No. 277 Underground Storage-Tank Blend
Operated by · 青山やまと
Mixed source
湯
Simple
Hot source · 51°C
Known good for
Aches & jointsstiff shoulders
Smooth skindry, rough skin
Recoveryfatigue, stress
A blended simple thermal water drawn from three Ito Onsen wells (Oka No. 173, Kamata No. 41, Oka No. 277) and mixed in an underground storage tank before being sent to the baths. Total dissolved solids sit at 696 mg/kg with a pH of 8.2 — weakly alkaline, gentle on the skin, and squarely in simple-spring territory. The wellhead is hot at 51 degrees Celsius and the water is cooled to the bathing range of 39 to 42 degrees before serving.
Sampled at mixing tank·Analyzed Oct 17, 2019·株式会社サイエンス
Seizan Yamato sits on a quiet hillside above Ito, with a large indoor and outdoor bath complex filled with kakenagashi (掛け流し) spring water that's soft on the skin. One of the baths, Tsuki no Yu (月の湯, "moon bath"), looks out over the town and Sagami Bay; men and women use it at different times of day. There's a sauna but no cold plunge. A private cypress bath, Suzume no Yu (すずめの湯), is normally a paid reservation but comes free as an official-site booking perk, and some of the higher-grade rooms have their own kakenagashi open-air tub on the balcony. It runs like a big, full-service ryokan rather than a small inn: staff carry the luggage, tea is brought to the room on arrival, dinner is served course by course in private dining rooms, and the futons are laid out fresh each night. Guests describe it as a classic ryokan stay with a bit more structure than the rustic version.
240. Seizan Yamato, Ito ★
Stayed overnight, had dinner and breakfast. A large ryokan, many guests, mostly Japanese, English is a bit difficult. In the evening there was a live performance somewhere in the ryokan (I did not look into the details, since it is not my thing). For kaiseki at dinner, you can choose the main dish from four options, in my case there were two to choose from, since it was a double kaiseki and they really do bring it. In the area closer to the baths and the changing rooms there were various jugs with water and tea.
1. Private wooden bath, can be reserved for 1650. I could not find a proper sign, only a sanitary one. The water is clear, temperature 43-44, easy to breathe, a pleasant solution with a window.
2. First set of baths by men/women.
2.1. Indoor bath. It is fine to breathe inside, but there is a slightly stale smell of water in the shower area (not from the hot spring, but from the shower drain). The city view behind the glass disappears when you lower yourself into the water. The water is clear, temperature 40.
2.2. Outdoor bath with clear water, temperature 42. There is a window with a view of the city, but when you get into the water the view disappears.
2.3. Sauna.
3. Second set of baths by men/women. The bath photos from the internet match.
3.1. Indoor bath with clear water. Water temperature 42. It is comfortable to breathe inside.
3.2. Outdoor bath in stone. A cozy onsen, but without a view. The water is clear, temperature 40-41.
3.3. Sauna.
The place is solid, the service is good, the food is tasty and interesting. There are no serious flaws, and everything is good, but I would not say the place made a strong impression.
08.11.2024 09.11.2024
