robg, I don't think there are a lot of English language resources. I ran it in 2008 and I know a lot of people on Dailymile have run it. You might try hoping on Dailymile and finding people there who've run it.

As far as I know, anyone from any country can enter the race. The application deadline is in March and opens about the second week in January. So you have 6 months to prepare if you sign up in January. A little bit of information can be found at the following links, in order of usefulness: http://running-hokkaido.blogspot.jp/2010/01/saroma-lake-100km-ultramarathon.html http://www.geocities.co.jp/Athlete-Crete/7686/eng/jmg_ultra/ultra_saroma.html http://www.kitamikanko.jp/english/57_06_marathon.html

Perhaps I should make some more detailed English information on this great race....

robg, Looks like the application deadline has been moved up a month to February. This year the deadline was 2/17 by mail and 2/28 by online application at runnet.jp.

Saroma Lake marathonは誰でも参加できます。今年は2012年6月24日 (日) に開催されました。

Thanks @clintonlane and @opapi - lots of information for me to review - much appreciated.