The Marathon des Sables is known as the toughest footrace on Earth and is the equivalent of six marathons.
The race is a gruelling multi-stage adventure through a formidable landscape in one of the world’s most inhospitable climates - the Sahara desert.
The rules require you to be self-sufficient, to carry with you on your back everything except water that you need to survive and is much a test of the mind as it is the body.
Andy Richardson reports from Morocco.
Source: Al Jazeera