Hiyama Onsen Oyu Center

ひやま温泉お湯センターひやまおんせんおゆせんたー

A swimmable open-air bath at a secluded mountain lodge

Mark it and it goes on your passport, with 20 drops. What's the passport?

Can I go?

Day visit ·

Yes

Mon09:30–17:00

Tue09:30–17:00

Wed09:30–17:00

ThuClosed

FriClosed

Sat09:30–17:00

Sun09:30–17:00

¥500

Adults ¥500, children ¥300.

About

This day-use bath sits in the mountains just beyond Akakura Onsen, at a small secluded lodge with its own separate hot spring source. There is one hot indoor tub and three open-air rotenburo, one of them wide and shallow enough to actually swim in. The water is soft, with a warmth that lingers well after you get out; the open-air pools tend to run cooler than the indoor one. Getting to the baths means a steep flight of steps down from the reception building, and the setting is quiet and isolated. The baths are separated by gender in the ordinary way, and on a quiet weekday you may well have the place to yourself.

The baths

Special here

Lukewarm BathWater near body heat, for a long soak.

Baths and water

Yes
OnsenUses natural hot spring water
Yes
Outdoor Bath. Open-air outdoor bath
Yes
Indoor Bath. Enclosed indoor bathing area
No
Mixed BathingShared bathing area for all genders

Also here

Kids✓ Yes

Not known yet: Sauna, Cold Bath, Private bath to book, Tattoo, Dining, Washing, Towels, Rest Area, and Parking. Been there? Tell us.

Programs1

Yamagata Onsen-do
A prefecture-wide onsen stamp rally across 86 baths in Yamagata, launched in 2026. Collect stamps in all four areas, Murayama, Mogami, Shonai and Okitama, and climb the ranks toward Onsen Master.
Area
Mogami
No.
51
View program