The Mongol Derby, a 1,000 kilometer scramble through the vast expanse of the Mongolian steppe.
The 'un route' —
Each of the competitors must navigate their own way between the 40 horse stations which make up the race's course.
The horses stations, or "urtuus" to use their Mongolian name, are a place where riders can eat and rest. Competitors must also swap horses at each station in order to maintain the health of the animals. Each horse has their heart rate checked at each station, if it is too high the rider is issued with a two-hour time penalty.
Horse power —
Lara Prior-Palmer, a 19-year-old from Hampshire in England, speeds out of one of the urtuus after swapping horses.
Late drama —
There was heartbreak for American Devan Horn at the finish when she crossed the line first only for her horse to fail its veterinary inspection. Horn (pictured in the background) was given a two-hour penalty, handing victory to Prior-Palmer. In this picture, Prior-Palmer receives a congratulatory phone call while Horn is comforted by a race steward.
Toasting victory —
There's no champagne for Prior-Palmer at the finish, but she is able to enjoy a hard-earned beer.