THE SPA Seijo

About the Hot Spring
Our natural hot spring is a hydrogen carbonate spring originating 1200 meters below ground. Kuroyu (hot black water) is a feature of natural hot springs in Tokyo, and as a product of ancient sea grasses and plants that merged into the rock layer, it is rich in minerals. Kuroyu has a velvety alkaline quality that is soft on the skin and is known for its heat retaining and moisturizing properties.
*The source water of our natural hot spring is additionally heated, and some filtration and circulation equipment is used.

Relaxation Rooms
We offer three different relaxation rooms!
●Kaiun (Theme of deep sea)
A medium- to low-heat relaxation room where hot yoga lessons are held. Effects include improved resistance to cold.

●Chinen (Theme of geotherm)
A medium- to low-heat relaxation room with natural rock salt on the walls. Effects of the mineral-rich natural rock salt include recovery from physical exhaustion.

●Shinka (Theme of forest))
A relaxation room equipped with reclining chairs and Ryukyu-tatami mats. Please take it easy here after your bath.