The 4 Deserts Ultramarathon Series is widely recognized as the most prestigious outdoor FOOTRACE series in the world
The 4 Deserts Ultramarathon Series is an annual series of four 250-kilometer (155-mile) races across deaerts around the globe.
The races were recognized as the world's leading endurance footrace series by TIME magazine in 2009 and 2010,[as the "Ultimate test of human endurance"
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