Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Itabashi Onsen is a community thermal facility in Itabashi Ward in northern Tokyo, a historically significant ward whose name—meaning 'board bridge'—recalls the wooden bridge that made this point on the Shakujii River a crucial waypoint on the Nakasendo highway connecting Edo with Kyoto, making Itabashi-juku one of the first post towns encountered by travelers leaving the shogunate capital for the western provinces. The siliceous mineral waters provide daily bathing for a densely populated urban ward whose traditional shitamachi (low city) character—street-level shotengai shopping arcades, local festivals, neighborhood temples, and the Itabashi Ennichi summer festival—maintains the informal communal spirit of old Tokyo neighborhood life. The Shakujii Park's forested ponds, the 4-kilometer Itabashi Green Road pedestrian promenade, and the warm mineral waters of this community onsen reflect the ward's determination to preserve Tokyo's historic neighborhood character in the face of continuous urban renewal.