The 4 Deserts Ultramarathon Series is an annual series of four 250-kilometer ( 155-mile ) races Competition across deserts around the globe .

In 2006 a fourth race Competition , called Name_conferral The Last Desert , took place Process_start in Antarctica and was the first year in which all 4 Deserts races Competition were held Hold in the same calendar year .

Competitors can enter Becoming_a_member any of the individual multiday races Competition within the 4 Deserts Race Series , but if they wish Request to take part Dispersal in The Last Desert ( Antarctica ) they must successfully finish Process_end at least two of the other races Competition in the series .

Many participants Participation return to compete Competition in additional events Competition , and there is a growing Cause_change_of_position_on_a_scale list of members Participation in the 4 Deserts Club and 4 Deserts Grand Slam Club .

Many participants Participation return to compete Competition in additional events Competition , and there is a growing Cause_change_of_position_on_a_scale list of members Participation in the 4 Deserts Club and 4 Deserts Grand Slam Club .

In 2013 , a documentary film Writing about 4 Deserts was released Publishing .