Iwaki-Yumoto-onsen Hot Spring
The Joban Coalfield was once located here, and the hot water of Iwaki-Yumoto-onsen is taken from the bored bottom of this field. There are some inns here, but among them, Spa Resort Hawaiian's is the one especially known to visitors: It is a large leisure center consisting of five theme parks such as Spring Park, Water Park, and the world's largest outdoor hot spring.
Address: Joban-Yumoto-machi, Iwaki, Fukushima
[Rail]2h20min ride by Super Hitachi (Joban Line) from JR Ueno Station to Yumoto Station.