About THE SPA Seijo
"THE SPA Seijo" is a natural hot spring facility in Setagaya City, Tokyo. Its bicarbonate spring water, which rises from deep underground, is known for its beautiful black water, a gift from ancient times, and is widely praised as a skin-beautifying bath that leaves the skin smooth. The open-air area also features pot baths with free-flowing spring water. The sauna is an ocher sauna, with walls made using ocher, where the powerful heat of far-infrared rays and a comfortable level of humidity encourage pleasant sweating. The spacious, deep cold plunge bath quickly cools down your heated body after the sauna. Forget the bustle of the city and refresh both body and mind with the high-quality black water and sauna.