Looking down towards Khalsar village in the Nubra Valley, Khalsar, Ladakh, India, Asia

Looking down onto the fertile Nubra Valley, Khalsar, Ladakh, India, Asia

Herd of yaks in high altitude mountains of Langtang Valley Trek near Kyanjin Gompa, Himalayas, Nepal, Asia

Al Hajir seen from track (Al Barida Road) on western slope of Djebel Ahkdar below Sharaf al Alamayn Pass, 2036m, Oman, Arabian Peninsula

Aerial of the Tousside peak above Trou du Natron, Tibesti Mountains, Chad

Aerial of the rocky mountains around Zouar, Tibesti Mountains, Chad

Alila Jabal Akhdar hotel, nestled 2000 metres above sea level, surrounded by Al Hajar Mountains, Sultanate of Oman, Arabian Peninsula

Rugged summits, high altitude winter valley on the Langtang trek in Kyanjin Gompa, Himalayas, Nepal, Asia

Lone stupa (chorten) in vast high altitude valley, Kyanjin Gompa, Langtang Valley trek, Himalayas, Nepal, Asia

Alila Jabal Akhdar hotel, nestled 2000 metres above sea level, surrounded by Al Hajar Mountains, Sultanate of Oman, Arabian Peninsula

Aerial of Kigoma, on Lake Tanganyika, Tanzania, East Africa, Africa

High altitude vegetation at Lauca National Park, near Arica, Tarapaca, Chile, South America

Gravel road leads to a high altitude laguna in the middle of a colourful South American landscape in the Andes, Eduardo Avaroa Andean Fauna National Reserve; Potosi, Sur Lipez, Bolivia

A 4x4 expedition truck is parked along a high altitude road over the desert; San Pedro de Atacama, Atacama, Chile

The Gioberney glacial cirque, flowering Alpine Rose (Rhododendron ferrugineum), La Chapelle-en-Valgaudemar, Ecrins National Park, Hautes-Alpes, France

Vicuna grazing, Salinas y Aguada Blanca Peru