Chiba Shibayama
A premium resort with natural hot springs that flow directly from the source and open-air baths overlooking planes soaring across the sky
"Narita Airport Onsen Sora no Yu" is a large bathing complex in Shibayama Town, Sambu District, Chiba Prefecture. From the open-air baths, you can watch planes soaring across the sky up close, and the natural hot spring with a strong saline spring rising from deep underground warms you through to the core. After enjoying the powerful heat of a full-scale dry sauna equipped with automatic löyly, cool down in a refreshing cold plunge bath fed by flowing well water that has not been altered in any way. The facility also features stone saunas, a capsule hotel, a spacious manga corner, and a relaxation area with a wood-burning stove, creating a blissful space where you can unwind all day before or after your trip, or on a day off.

A natural hot spring with a strong saline source rising from deep underground. Rich in iodine, the spring's minerals soak thoroughly into the body, so the warmth after bathing lasts a long time. From the open-air baths, you can admire planes soaring across the sky up close and enjoy a special bathing experience full of openness.

A private space with a calm Japanese atmosphere where you can have a natural hot spring flowing directly from the source all to yourself. Without worrying about those around you, you can relax with your family or loved ones and savor high-quality water and luxurious time to your heart's content.

A full-scale dry sauna equipped with an automatic löyly function that activates at set intervals. Steam rising from the heated sauna stones spreads throughout the room, filling it with powerful heat that envelops the entire body. It draws out a thorough sweat and leads you into deep refreshment.

A women-only steam sauna. Steam is applied to dry herbs that are regularly replaced, filling the room with a rich fragrance. Surrounded by mild heat and the soothing scent of herbs, you can slowly encourage perspiration and enjoy a superb relaxation effect.

A luxurious flowing cold plunge bath that uses well water drawn up from deep beneath the earth and served exactly as it is, with no treatment at all. The mellow feel and cool clarity unique to genuine groundwater gently soothe a heated body, elevating the post-sauna cooldown into a truly exceptional experience.

A stone sauna with a wide variety of experiences, including spacious rooms using multiple kinds of minerals, a room where heatwave events are held, and an area where you can quickly cool your body with cold air. Wearing dedicated clothing, men and women can use it together, and with the effects of far-infrared rays, you can warm up from the core while enjoying detox to your heart's content.

A women-only stone sauna room with a dreamy space where pink rock salt glows mysteriously. Without worrying about the eyes of others, you can leisurely work up a sweat in a calm atmosphere and enjoy a deeply relaxing time.
Availability and rates are shown on each booking site.
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Most of what we surveyed never made it onto this site. This is a further cut from what did — places the editor bathed in himself, and places chosen through our own reporting.