Infomapjapan, run by a vancouver publishing company, is a Japan travel site with loads of information on the best sightseeing spots in Japan, including information on onsens, accommodation information, maps,  optional tours and more. Infomap is also a free magazine providing information on Japan which comes out quarterly. I recommend grabbing a copy if you are a visitor to Japan.

Onsen Blog is an onsen focused blog created by a Japanese national by the name of Sonoe san. She provides useful information on onsens such as price, type of onsen, accessibility, atmosphere etc.  She also has an interesting Q&A section where she gives informative answers to questions such as ‘Where would be an ideal location visit as a day trip from Tokyo?’ and ‘Can I go in an onsen privately’?

Kusatsu Onsen, as the name suggests, focuses on onsens in the Kusatsu area. They have a load of information on Kusatsu Onsens and things to see and do in the Kusatsu area. Other than the onsens, some of the other things to do there are hiking, skiing and general sightseeing around the picturesque town.

Japanican has a great onsen guide allowing you to search for onsens by region or by season. They also have alot of interesting information such as a list of hotels with open air private baths.

The Nara Prefecture site is created by Nara prefectural government and provides information on a wide variety of topics relating to Nara and its surrounds. The tourism section is particularly good and has detailed information on parks, transportation, temples, accommodation, events, hot springs (onsens), annual events, arts and crafts and local delicacies.

Sentoguide.com is a site created by a foreigner living in Japan wanting to provide information to other foreigners about the local sentos. SentoGuide only focuses on the smaller public baths located in local neighbourhoods, as well as some larger chains of  sento.

At the time of this article the site had just over 550 sentos listed in the database.

Japaneseguesthouses.com has a vast amount of information on guest houses (ryokans) and onsens in Japan. They have a comprehensive list of onsens separated by region and a nice list of popular destinations in Japan.

Onsen Express is a good site for finding Onsen information on Japan. They also have quite a few useful articles and a ‘How to’ guide to using onsens.

Onsenjapan.net is a great site for finding information about Japanese onsens. They have a really cool interactive map separated by region, making it easy to get an overview of onsens in different regions around Japan.

Outdoor Japan is a great site for finding information on anything outdoor related in Japan. They have a range of information from area guides, activity guides, onsen guides, travel info, races and events etc.

Secret Japan-Onsen is an onsen site with about 130 onsens listed. You can search for onsens via a drop down menu separated by region. You can also search for onsens with different features such as with/without an outside bath, onsens with views, onsens with free baths and onsens within easy reach of Tokyo.