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Welwitschia mirabilis, the famous fossil plant, a desert succulent, Namib-Naukluft Park, Namibia, Africa

Woman walks to Cancha de Bochas (Expanse of circular stones) in Parque Provincial Ischigualasto (Valle de la Luna), Argentina, South America

Rock pillars formed by erosion of thick hard layer of calcrete over soft limestone, The Pinnacles Desert, Nambung National Park, near Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific

Rock pillars formed by erosion of thick hard layer of calcrete over soft limestone, The Pinnacles Desert, Nambung National Park, near Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific

Typical Tuscan homestead, Il Belvedere, and landscape at San Quirico d'Orcia in Val D'Orcia, Tuscany, Italy

A local man wearing a sunhat rides a bicycle on the road to Sebba through the desert drought areas of Burkina Faso (formerly Upper Volta)

Early morning mist on red sand dunes which are up to 300m high, Sossusvlei valley, Namib-Naukluft Park, Namibia, Africa

Early morning mist on red sand dunes which are up to 300m high, Sossusvlei valley, Namib-Naukluft Park, Namibia, Africa

A rock carving depicts the Golden Calf of the Old Testament under Mount Sinai, at St Catherine's Monastery, Sinai Peninsula, Egypt, North Africa, Africa

Hot air balloon suspended over the Theban hills of Luxor at sunrise, Thebes, Egypt, North Africa, Africa

John Ford's Point and the Three Sisters and cowboy on horse, Monument Valley, border of Arizona and Utah, United States of America, North America

Photographer with Mexican giant cardon (Pachycereus pringlei), Isla San Esteban, Baja California, Mexico, North America

Fields and date palms in the fertile valley of Wadi Doan, with arid escarpment behind, in the Wadi Hadramaut, south Yemen, Middle East

Early morning light on corrugated badlands landscape at Zabriskie Point, Death Valley National Park, California, United States of America, North America

Typical Tuscan homestead, Il Belvedere, and landscape at San Quirico d'Orcia in Val D'Orcia, Tuscany, Italy

Erosion helps form stunning formations in the rocks of the Coloured Canyon, Sinai South, Egypt, North Africa, Africa

Patterns in sand dunes in Erg Chebbi sand sea, Sahara Desert, near Merzouga, Morocco, North Africa, Africa

Detail from the dramatic landscape of the Painted Hills, where rapid erosion has shaped colourful mineral-rich clays, John Day Fossil Beds National Monument, Oregon, United States of America, North America

Mountain sheep herded by shepherd near Portizia de la Reina on Picos de Europa mountains, in Castilla y Leon, Northern Spain

Landscape including Chiu Gompa beside Lake Manasarovar on the Barga plain with Mount Kailas (Mount Kailash), sacred to Buddhists and Hindus behind, in Tibet, China, Asia

Mankwe Dam, central lake in the Pilanesberg National Park, North West Province, South Africa, Africa

Salar de Uyuni salt flat and Mount Tunupa, Andes mountains in the distance in south-western Bolivia, South America

Mount Ngauruhoe, 2287m, and Red Crater on the Tongariro Crossing, Tongariro National Park, the oldest national park in the country, UNESCO World Heritage Site, Taupo Volcanic Zone, North Island, New Zealand, Pacific

Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America

Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America

White Sands National Monument, world's largest gypsum dunefield, New Mexico, United States of America, North America