Phone Reservations +81-837-25-3300

[Reception Time] 9:00 a.m. - 6:00 p.m. JST

Best Rates Guaranteed

Making a reservation from our website is the most cost-effective

Phone Reservations +81-837-25-3300

[Reception Time] 9:00 a.m. - 6:00 p.m. JST

Topics

Hello from the astronomical observatory dome! Information on this month's starry skies

Hello from the astronomical observatory dome! Information on this month's starry skies

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Reach locations throughout Yamaguchi Prefecture at an hour's distance from Otani Sanso by car.

With Nagato Yumoto Onsen as your base, how about a trip through beautiful scenery, caves, and history?

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Enjoy a soothing winter onsen trip

The winter months, when the air fills with steam from the onsen, are the time to enjoy both onsen and the rich flavors of the season.

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Bountiful nature, seasonal nature
For a day of absolute relaxation

Enter a space in which to unwind in peace,
set at ease in the rich nature and seasonal scenery that surrounds you.

Allow us to treat you to our unmatched hospitality,
and relax completely in the time you spend with us.

Forget the hustle and bustle of the everyday when you immerse yourself in this tranquil space,
and experience the seasons of Yumoto Onsen on your skin, with your tongue, and with your ears.

Rooms

We have prepared rooms in a variety of styles, from Japanese, to those with private outdoor baths, to Western-style--please select a room according to your tastes. Enjoy a room with a different view each time you stay with us: a luxury you can only enjoy at Otani Sanso.

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Dining

Experience the seasons of Yumoto Onsen on your skin, with your tongue, and with your ears, as you forget the hustle and bustle of the everyday, and immerse yourself in this tranquil space.

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Onsen & Spa Services

Delight in not only the warm hot spring waters of our two types of bath, but also in the landscapes of the seasons as you look out on the rushing waters of the Otozure River. These onsen are open alternately to men and women, so guests are able to enjoy the respective charms of the sounds, light, and views from the variety of baths available in each onsen.

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Lodging Plans

Winter Delights (Tiger Pufferfish Full Course A)

This plan is a winter-only plan, available from October until March of the following year. Enjoy a dinner of Yamaguchi Prefecture's famous tiger pufferfish during its freshest season with this full course.

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Guest Rooms with Private Outdoor Baths

Opened on August 1st
Otani Sanso offers a total of 18 guest rooms with natural hot spring outdoor baths. 4 types of scenery, and 8 types of room are available.

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Teppanyaki Dinner Course

This popular course allows you to taste both Yamaguchi Prefecture's own Japanese Black wagyu beef steak, and fresh fish.
Enjoy conversation with the chef as you savor each of the many delightful dishes.

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Otanisanso journal

Allow us to introduce you to the best of Yamaguchi Prefecture:
the people, towns, and things you'll only find here.

Astronomical Observatory

2019/11/27

【November in the Observatory】Why is winter star-gazing season? The winter constellations will appear, sparkling brightly in the eastern sky

Astronomical Observations Astronomical observatory dome Experience 体験 天体ドーム 天体観測 長門湯本温泉

Astronomical Observatory

2019/10/12

【October in the Observatory】The Night of the Full Moon and the Double Cluster in the constellation of Perseus. Come and enjoy the autumn nights!

Astronomical Observations Astronomical observatory dome events Experience

Astronomical Observatory

2019/08/27

【August in the Observatory】Look up with your children and try to find the Summer's Great Celestial Triangle!

Astronomical Observations events Experience

Astronomical Observatory

2019/07/10

【July in the Observatory】Summer's main event is the planets! Come see the solar system's top two largest, Jupiter and Saturn!

Astronomical Observations Astronomical observatory dome events Solar terms Summer

2208 Fukawa Yumoto, Nagato-shi, Yamaguchi 759-4103

Best Rates Guaranteed

Making a reservation from our website is the most cost-effective

About our Best Rate Guarantee

We also accept reservations for children(in rooms other than the twin size)