Sano Natural Onsen: Noborigumo
Sano Natural Onsen Noborigumo is an inviting local retreat in Yokosuka that combines modern wellness facilities with a distinctive architectural flair. The water for the facility is pumped from 800 meters below ground level, emerging at a natural temperature of 32.5°C before being re-heated to approximately 42–43°C for the baths. This makes it slightly hotter than the average Japanese hot spring, appealing to those who prefer a deep, penetrating heat. The mineral-rich water is high in sodium chloride and initially appears clear, though it takes on a light golden hue upon contact with the air due to oxidation.
The Yagura Architecture and Natural Light
The primary bathhouse is designed in a “yagura” style, featuring a striking conical roof that allows natural light to pour into the center of the room. This design creates an airy, spacious atmosphere that avoids the humid, cramped feeling common in older public baths. The indoor area features a large rectangular tub where the mineral concentration and heat are most intense. Outside, the facility offers a more organic experience with natural stone-lined baths surrounded by greenery. A unique feature of the outdoor area is the “walking bath,” a shallow, cool-water course where visitors can stride through the water to improve circulation and massage the soles of their feet.
Salt Wellness and Regional Dining
In addition to the standard hot baths and cold-water plunge pools, Noborigumo is well-regarded for its sauna variety. Along with a standard high-temperature sauna, the facility includes a low-temperature salt sauna. Here, guests can apply salt to their skin to promote exfoliation and detoxification while sweating at a gentler pace. After bathing, visitors often head to the Miura-mise restaurant located on-site. The restaurant specializes in shabu-shabu and seasonal dishes utilizing fresh produce and seafood sourced directly from the Miura Peninsula, making the facility a comprehensive destination for both relaxation and local gastronomy.
Visitor Information
| Address | 4-5-5 Sanocho, Yokosuka, Kanagawa 238-0052 (Google Maps) |
| Opening Hours | 9:00 AM – 12:00 AM (Last admission 11:00 PM) |
| Closed | Open daily (Subject to maintenance closures) |
| Price | Adults: ¥1,100 (Weekdays) / ¥1,200 (Weekends) Children: ¥550 (Weekdays) / ¥600 (Weekends) |
| Website | Visit Website |
Access
| Station | Line(s) | Access Details |
|---|---|---|
| Kinugasa Station | JR Yokosuka Line | 10-minute bus ride toward Yokosuka Station (Alight at Sano 4-chome) |
| Yokosuka-chuo Station | Keikyu Main Line | 10-minute bus ride toward Kinugasa (Alight at Sano 4-chome) |