UK - Princes William and Harry are set to go off-road on a charity motorcycle adventure.
The challenging rally later this month lasts eight days and will be no easy ride.
Sky News' Royal correspondent Sarah Hughes said it will suit the princes well.
"Two years ago Prince William bought a 175 mph superbike and it's understood Prince Harry recently underwent intensive training to gain his licence ahead of the charity ride," she said.
"Both of them have been riding motorbikes around their father's Highgrove estate for years.
"This trip allows William and Harry to combine three of their greatest passions: charity work, Africa and adventure."
A spokesman for Global Enduro who are running the Enduro Africa event said the company was looking forward to riding with royalty.
"As they are both in the Armed Forces, I'm sure they will have the grit to get through because it's not easy."
The royal brothers will join a group of around 80 people riding across South Africa.
A similar number of Enduro Africa bikers are already travelling across the chosen route.
Each rider has donated a minimum of £1,500 to take part in the event.
Between them the volunteers have raised more than £300,000 for three charities close to the Princes' hearts; Sentebale, Unicef and the Nelson Mandela Children's Fund.
Sentebale was founded by Harry with Prince Seeiso of the Lesotho Royal family in 2006 and named in memory of his mother, Diana, Princess of Wales.
Harry returned to visit some of his organisation's projects in the summer.
It gives assistance to community initiatives that help youngsters, particularly children orphaned by the country's Aids epidemic.
The riders will travel in groups of eight to 10 riders and all 80 volunteers will camp together at night.
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