09/03/2009 03:53 pm ET Updated May 25, 2011

Video: Marathon of the Sands (Marathons Sands)

The best-known ultra marathon in the world, and the most grueling, the Marathon of the Sands is 150 miles in six torturous races over seven days across the burning sands of the Sahara Desert in Morocco, including “Dune Day” through the Sahara’s highest sand dunes. More than 700 competitors come from around the world in the mens and womens divisions. In this 14th Marathon of the Sands, American Lisa Smith defends her title. The Men’s division is lead by the amazing Ahansal brothers from the remote Saharan town of Zagora.

Watch the documentary

Read more on SnagFilms