The trip has the support of the Royal Geographical Society and its patron Princess Anne, who officially launched the expedition in September, and Saudi Arabian authorities
British explorer Mark Evans and Reem Philby are greeted at the launch of the second leg of the Heart of Arabia expedition. All photos: Ana-Maria Pavalache / Heart of Arabia expedition
Mr Evans, left, with Sara Philby, Mandy Oates, Michael Engelbach and his wife, Reem Philby and Sami Alotaibi in the historic At-Turaif District
Logistics lead Alan Morrisey, left, Mr Evans, right, with members of the Philby family and Saudi officials
Mr Evans is leading the team in the footsteps of Harry St John Philby, who crossed the Arabian Peninsula by foot and camel in 1917
Mr Evans holds up the Explorers Club flag with officials from the Saudi Ministry of Culture ahead of the second leg of the Heart of Arabia expedition
The team set off from the Unesco World Heritage centre of At-Turaif
They left Al Diriyah along the Wadi Hanifa valley
They will travel westward across the deserts that separate Riyadh from the Hijaz mountains and eventually to the Red Sea
They aim to reach the coastal city of Jeddah by January 30
The Jabal Tuwaiq is seen in the background as the team cross the desert
The team must now navigate muddy terrain because of the rain
The limestone ridge of Jabal Tuwaiq can be ascended by a series of winding paths
These paths allowed travellers to traverse the ridge while riding camels
Reem Philby and Mark Evans on Jabal Tuwaiq
Jabal Tuwaiq is a 600m-high limestone ridge that cuts through the region
The escarpment is usually dry and dusty, but rainy weather in winter months can cause mud and floods
The ridge offers spectacular views of the desert
Views from Jabal Tuwaiq
The Saudi desert in its splendour
The expedition brought together two wings of Philby's family for the first time
The trip has the support of the Royal Geographical Society and its patron Princess Anne, who officially launched the expedition in September, and Saudi Arabian authorities
British explorer Mark Evans and Reem Philby are greeted at the launch of the second leg of the Heart of Arabia expedition. All photos: Ana-Maria Pavalache / Heart of Arabia expedition
Mr Evans, left, with Sara Philby, Mandy Oates, Michael Engelbach and his wife, Reem Philby and Sami Alotaibi in the historic At-Turaif District
Logistics lead Alan Morrisey, left, Mr Evans, right, with members of the Philby family and Saudi officials
Mr Evans is leading the team in the footsteps of Harry St John Philby, who crossed the Arabian Peninsula by foot and camel in 1917
Mr Evans holds up the Explorers Club flag with officials from the Saudi Ministry of Culture ahead of the second leg of the Heart of Arabia expedition
The team set off from the Unesco World Heritage centre of At-Turaif
They left Al Diriyah along the Wadi Hanifa valley
They will travel westward across the deserts that separate Riyadh from the Hijaz mountains and eventually to the Red Sea
They aim to reach the coastal city of Jeddah by January 30
The Jabal Tuwaiq is seen in the background as the team cross the desert
The team must now navigate muddy terrain because of the rain
The limestone ridge of Jabal Tuwaiq can be ascended by a series of winding paths
These paths allowed travellers to traverse the ridge while riding camels
Reem Philby and Mark Evans on Jabal Tuwaiq
Jabal Tuwaiq is a 600m-high limestone ridge that cuts through the region
The escarpment is usually dry and dusty, but rainy weather in winter months can cause mud and floods
The ridge offers spectacular views of the desert
Views from Jabal Tuwaiq
The Saudi desert in its splendour
The expedition brought together two wings of Philby's family for the first time
The trip has the support of the Royal Geographical Society and its patron Princess Anne, who officially launched the expedition in September, and Saudi Arabian authorities