AKIPRESS.COM - A young Australian Olympian has won the longest and toughest horse race in the world, ABC reported.

Ed Fernon, 29, conquered the gruelling Mongolian Derby, crossing the finish line with South African Barry Armitage in equal first after a nail-biting race to the finish.

The 2017 race saw 12 men and 24 women from nine countries riding 1,000 kilometres across Mongolia on semi-wild horses.

Mostly riding full tilt, they charge through the rugged terrain of the Mongolian Steppes, fording rivers, deserts and wide open plains on a course that is designed to recreate Genghis Khan's ancient postal system.

It puts to the test the competitor's survival skills, horsemanship and sheer endurance.

Competitors change horses every 40 kilometres and camp out under the stars or stay with local herders.

Horses will often injure the participants if badly handled, and riders are also given penalties if they overwork the tough Mongolian ponies.