Briton Lara Prior - Palmer , 19 , is youngest winner of Mongol Derby . It is the nomadic tribes who provide the horses for the race and equine welfare Race recognized by the Guinness Book of Records as the world 's lengthiest . Race draws inspiration from the Ottoman Empire 's secret postal service . ` ` This is no guided tour , or pony trek , '' says race website .
Briton Lara Prior - Palmer , 19 , is youngest winner of Mongol Derby . Race recognized by the Guinness Book of Records as the world 's lengthiest . Race draws inspiration from the Ottoman Empire 's secret postal service . ` ` This is no guided tour , or pony trek , '' says race website .