William, Harry in Africa bike ride

Princes William and Harry are to take part in a “treacherous” motorbike trip across Africa.

The two young royals will join a group of around 80 people in the eight-day charity rally, after undergoing intensive training to prepare for the trip, which is said to be tough for even experienced riders.

Sources say the journey was 26-year-old William’s idea, and he managed to persuade Harry, 24, to take part after he passed his motorbike driving test last month.

Enduro Africa 08 organiser Simon Smith warned: “We’re looking forward to riding with them and, as they are both in the Armed Forces, I’m sure they will have the grit to get through because it’s not easy.

“There are no road signs and it’s not like riding anywhere in the UK so they will need a guide. They will go through game reserves, tribal areas and wild areas.”

“It is a very tough challenge. They face incredibly steep and dangerous terrain. It’s a treacherous route with blood-curdling descents. They will sleep in tents and barns. There will be no posh hotels or luxury spas.”

The princes will travel with a small group of riders during the day but meet up with the other participants each night.

Each rider has donated a minimum of £1,500 to take part in the event, with the aim of raising a total of £300,000 for three charities, Sentable – which was established by Harry in 2006 in honour of his late mother Princess Diana – UNICEF and the Nelson Mandela Children’s Fund.

A Clarence House spokesman said: “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.”