I Looked Into Tenzan Toji-kyo

In my "Komorin's Imaginary Trips" series, I've been gradually researching not just campsites, but also day-trip hot springs and "hokans" (hotel + vacance) facilities that could work for those days when I think, "forget camping today, I just want to relax at an onsen."

This time I looked into Tenzan Toji-kyo, located in the Hakone-Yumoto area. I came across information saying it has as many as seven of its own natural hot spring sources, and that alone caught my interest enough to dig deeper.

What Kind of Place Is Tenzan Toji-kyo?

Tenzan Toji-kyo is apparently a hot spring retreat spread across roughly 8,000 tsubo (about 26,400 square meters) of land along the Suzukawa River, in the Yumoto-chaya area of Hakone, Kanagawa Prefecture. It's made up of three facilities: a day-use spa, a regular-visit spa, and a longer-stay lodging facility. It seems the day-use spa is mainly the one you can visit without an overnight stay.

What stood out to me was that water from seven natural springs welling up on or right next to the property, totaling about 20,820 liters per hour, or roughly 500 tons a day, is piped directly into the baths and temperature-adjusted using a cooling heat exchanger, without adding any tap water. On top of that, the bath temperature is apparently managed with a precision of plus or minus 0.1 degrees Celsius, which suggests a real dedication to the quality of the water. There are two types of spring water, an alkaline simple spring and a sodium chloride spring, and one of them, spring number 74 in Yumoto, is said to be the only spring in Hakone with a permit for drinking the water.

• Hours: 9:00 AM to 11:00 PM (last entry at 10:00 PM), open year-round, though it seems to close for a few days in mid-December
• Admission: 1,450 yen for adults, 700 yen for children (ages 1 through elementary school), including bathing tax and consumption tax; payment is basically cash only
• Reservations: Day-use visits and restaurant use can't be reserved in advance, only accepted on the day itself, and it seems groups larger than 6 adults or visits as part of sightseeing tours aren't allowed, so this looks like the kind of place you drop into individually rather than in a big group

Komorin

Being able to drop in on the day without a reservation might be a nice point even for indoor types like me. But since groups aren't allowed, I got the sense this is less a place for a big lively crowd and more somewhere you visit quietly, alone or with just a couple of people.

Checking Out the Men's and Women's Baths

The men's bath apparently has an indoor bath and an outdoor bath, plus a steam sauna called a "kettle bath." The women's bath seems to have an indoor bath and an outdoor bath as well, along with a steam sauna called a "spring-water steam bath" and a dry sauna. Both bathing areas are said to be equipped with shampoo, conditioner (using an additive-free brand with no synthetic chemicals), soap, and hair dryers, so it seems like you wouldn't have much trouble even showing up empty-handed. That said, bringing your own small towel is recommended, though they also seem to sell them at the front desk.

While researching, I came across mentions on several third-party sites of a cave bath in the women's area, said to make use of the natural rock face of the mountain behind the facility, sometimes referred to as a fertility cave. However, I couldn't find this mentioned in the official site's main text, so I'm including it here only as a reference. If you're curious, it might be worth checking directly with the facility before visiting.

• Regarding tattoos: it seems a single visitor with a tattoo won't be turned away, but visits by multiple people with tattoos together don't appear to be allowed
• Children bathing: it seems the men's and women's bath assignment for kids is based on height (110 cm) rather than age

Dining and Relaxation Areas Also Seem Well Equipped

Tenzan Toji-kyo isn't just about the hot springs. It seems the dining options and lounge spaces inside are quite substantial too. There's apparently a restaurant called Yamabushi serving nourishing dishes, a place called Rakuten known for shabu-shabu made with water from one of Tenzan's seven springs, and a spot called Ukaregumo where you can enjoy coffee and cake made using drinkable spring water.

• Rest area called Zashikibokko: a space where you can lie down and rest by the Suzukawa River, open from 10:00 AM to 10:00 PM
• Body care service called Seoto: hands-on therapy starting from 2,000 yen for 20 minutes
• Private rental room called Hanare-gumo: a detached room with access to a private bath called Oku-no-yu split by gender for guests only, with a base room fee of 4,500 yen (2 hours, up to 3 people per room)

As someone who leans indoors, having a space to just lie around after soaking in the bath feels like a quietly nice touch. There also seem to be other day-use hot springs and soba shops within walking distance, so it looks easy to plan a bit of a stroll around the area too.

Rakuten Mobile Signal Conditions

When I checked this facility's location using the official My Area Connectivity Simulation tool, the overall rating came out as C.

Since it's rated C, it might be worth checking your connectivity situation ahead of time. The fact that it's located in a valley might have something to do with it. If your main plan is just to relax in the hot spring, it probably won't matter too much, but if you're planning to watch videos or make calls, it might be reassuring to check in advance.

Komorin

As far as I could tell, it's rated C. Still, while you're soaking in the bath there probably aren't many chances to check your phone anyway, so I figured knowing this ahead of time would help you settle in and relax more easily.

If you're curious, you can check it yourself using Rakuten Mobile's official tool, so it might be worth taking a look before you actually head out.

Wrapping Up

Putting it all together, Tenzan Toji-kyo struck me as a rustic hot spring retreat that delivers water from seven natural springs welling up in a valley along the Suzukawa River straight into the baths without diluting it with tap water. Between facilities like the kettle bath and steam sauna, plus the well-rounded lounge and dining areas, it seems like the kind of place designed for spending a full, unhurried day. Rakuten Mobile's signal came out rated C, so it might be worth keeping that in mind while planning a trip focused on enjoying the water itself.

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Related Links

• Official Site