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Check dams crossing valley to control risk of flash flooding down steep hillside, Mirleft, Morocco, North Africa, Africa

Land rover game vehicle parked by sand road at sunrise, Namib Rand game reserve, Namib Naukluft Park, Namibia, Africa

View of land and villages in barren interior of Fuerteventura, Canary Islands, Spain, Atlantic, Europe

The endemic lava cactus (Brachycereus spp) growing in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos Land Iguana (Conolophus subcristatus), large lizard can can grow to five feet long and live for 60 years, South Plaza island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Boundary gate and cattle-proof fence between Coconino National Forest and Wet Beaver Creek Wilderness, Arizona, United States of America

Sandstone rock tower beside a large dry salt lake in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Aerial view from helicopter, of a farm in an ancient oasis in the desert with canyons of the Ashar Valley,AlUla, Medina Province, Saudi Arabia

Dry waterfall cliffs, Johnson Canyon between Bainbridge Steel and Stone Dams near Ash Fork, Kaibab National Forest, Arizona, United States of America

Close to entrance to Jenny's Canyon, Snow Canyon State Park, near St. George, Utah, United States of America

Boulder pile in a valley leading to Dead Wash, Petrified Forest National Park, Arizona, United States of America

Al Bardah, village on edge of Wadi Bani Awf, NE slope of Jebel Akhdar, Western Hajar Mountains, Al-Dakhiliyah region, Oman, Arabian Peninsula

Rock formations near Skyline Arch, Arches National Park, Moab, Utah, United States of America, North America

Highway US89A looking east to Vermilion Cliffs National Monument with Kaibab National Forest boundary sign, Arizona, United States of America

The boundary fence on the east side of Petrified Forest National Park, Arizona, United States of America

Camels in the Sharqiya Sands, formerly Wahiba Sands, desert region, Sultanate of Oman, Arabian Peninsula

Isolated tree among sandstone rock formation in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Flock of sheep and goats, Ammeln valley with Djebel Lekst in background, near Tafraout, Anti-Atlas, Morocco

System of protection against invasion of desert sand in palm grove of Zagora, Draa River valley, Province of Zagora, Region Draa-Tafilalet, Morocco

Car trail lights on desert road crossing the barren land at dusk, Vallebron lookout, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Aerial view of sunrise over the dry desert land of Caldereta, Vallebron, La Oliva, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Farmer using pair of oxen to turn water wheel to draw water from well for irrigation at Samad in Pali District of Rajasthan, Western India

Journey in 4-wheel drive vehicles through the Sahara Desert in Upper Volta, now re-named Burkina Faso

Farmer using pair of oxen to turn water wheel to draw water from well for irrigation in Pali District of Rajasthan, Western India

Farmer using pair of oxen to turn water wheel to draw water from well for irrigation in Pali District of Rajasthan, Western India