Popular Hot Spring Resorts
Hokkaido:
Noboribetsu Onsen, Lake Toya Onsen, Sadayamakei Onsen, Akanko
Onsen, Yunokawa Onsen, Sounkyo Onsen, Niseko Onsenkyo
Tohoku:
Nyuto Onsenkyo (Akita), Zao Onsen (Yamagata), Okuirase Keiryu
Onsen / Towada Lakeside Onsen (Aomori), Hakkoda Onsen / Sukayu
Onsen (Aomori), Akiho Onsen (Miyagi)
Kanto / Koshinetsu:
Kusatsu Onsen (Gunma), Hakone Onsen (Kanagawa), Kinugawa Onsen
(Tochigi), Ikaho Onsen (Gunma), Manza Onsen (Gunma)
Tokai:
Atami Onsen (Shizuoka), Gero Onsen (Gifu), Oku-Hida Onsenkyo
(Gifu), Hida Takayama Onsen (Gifu), Shuzenji Onsen (Shizuoka)
Kinki / Hokuriku:
Arima Onsen (Hyogo), Kinosaki Onsen (Hyogo), Wakura Onsen
(Ishikawa), Kaga Onsenkyo (Ishikawa), Shirahama Onsen (Wakayama)
Chugoku / Shikoku:
Dogo Onsen (Ehime), Tamatsukuri Onsen (Shimane), Misasa Onsen
(Tottori), Kaike Onsen (Tottori), Konpira Onsenkyo (Kagawa)
Kyushu:
Beppu Onsenkyo (Oita), Kurokawa Onsen (Kumamoto), Yufuin Onsen
(Oita), Ibusuki Onsen (Kagoshima), Ureshino Onsen (Saga)
Reference URL: "Top 10 Popular Hot Spring Resorts," Jalan
(Japanese)
https://www.jalan.net/jalan/doc/etc/onsenranking/onsenranking_index.html