Maenohara Onsen Sayano Yudokoro 前野原温泉 さやの湯処
A real spring from 1,500 m; on the podium (1/35) of Itabashi spas on TripAdvisor (4.2/251).
A private hot-spring complex in a restored old manor house from 1946. It is one of the two facilities listed under the ‘板橋温泉’ entry of Japanese Wikipedia. First of 35 hot-spring facilities in Itabashi on TripAdvisor, with 251 reviews and a rating of 4.2/5.
Tokyo
Shimura-sakaue, Motohasunuma