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

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

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

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

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

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