The two are scheduled to participate in an off-road motorbike rally to benefit Harry’s Sentebale charity, their office confirms.
Enduring tough terrain and sleeping under tents for about a week, the royal pair will to travel the route with a group of friends later this month in South Africa.
“The Princes are looking forward to the motorcycle ride that will raise money and the profile of Sentebale, a charity very close to their hearts, and two other major charities in southern Africa,” a spokesman for their office says.
Sentebale aids disadvantaged children in the mountain kingdom of Lesotho – where Harry helped build a school this summer.
William, 26, and Harry, 24, are said to be avid cyclists. Their upcoming journey will also combine two of their great loves – Africa and adventure – as they join about 80 other riders in the trip organized by Enduro Africa.