The Marathon des Sables (MdS, Marathon of the Sands, or Sahara Marathon)[1] is a six-day, 251 km (156 mi)[2] ultramarathon, which is approximately the distance of six regular marathons. The longest single stage (2009) is 91 km (57 mi) long.
This multiday race is held every year in southern Morocco, in the Sahara Desert. It is considered the toughest foot race on Earth.[1][3] The first event of the Marathon started in 1986