Big Dog's Backyard Ultra
ultrasignup.com
ultrasignup.com
For the team competition: Wouldn't it make sense to have your country's race on a very easy course, like in a stadium, rather than through some backwoods with hills? Just to give you an edge compared to the other countries' teams.
As one example, a few years back at the original race, it was down to two runners but one had to catch a plane back home to his country and they both agreed that it wouldn’t be a fair way for the other runner to win, so the two of them quit after something like 3 days of running and there was no winner that year.