The feat by Eliud Kipchoge is the largest single improvement on the marathon world record since Derek Clayton improved the mark by 2:23 in 1967.
Kenya-born Rose Chelimo was in the lead by the 30-kilometre mark and won in 2 hours, 34 minutes and 51 seconds.
They are aspiring ultra-marathon runners, hoping the sport will put their remote village on the map and provide the funds needed to rebuild homes destroyed by 2015 earthquake.
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