Natural hot spring. Open 24/7 & a 15-minute car ride from Haneda Airport. Including a variety of services such as massage salons & an on-site restaurant. With 150 tons of hot spring waters bubbling up from 2,000 meters below ground, Heiwajima Hot Springs is one of the largest natural hot spring facilities in Tokyo. The sodium-chloride spring water forms a thin layer over your skin, preventing evaporation & keeping the skin hydrated