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Re:A Tarahumara woman won a Mexican ultramarathon in sandals... by ericol on Thursday August 22, 2019 @01:14PM (#20770297)
50K is actually closer to 20% more than a regular marathon. Also, as per wikipedia:

An ultramarathon, also called ultra distance or ultra running, is any footrace longer than the traditional marathon length of 42.195 kilometres (26.219 mi).

Re:A Tarahumara woman won a Mexican ultramarathon in sandals... by frereubu on Thursday August 22, 2019 @01:42PM (#20770581)
Marathons are also generally on flatter ground aren't they? This is trail running, so off-road with much more variable ground to deal with, and often much more climbing and descending (although I don't know this race in particular).