Onsen near a city
Eleven cities and every onsen within reach of each: the places within a set distance of the city's main station, as the crow flies, and the onsen areas inside that circle.
Onsen near Tokyo
1,028 places within 150 km of Tokyo Station
Onsen near Nagoya
174 places within 90 km of Nagoya Station
Onsen near Hiroshima
243 places within 130 km of Hiroshima Station
Onsen near Kagoshima
184 places within 60 km of Kagoshima-Chuo Station