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Rolling orange sand dunes and sand ripples in the Erg Chebbi sand sea near Merzouga, Morocco, North Africa, Africa

Shadows of two people walking up the dunes of the Mesquite Flats sand dunes, Grapevine Mountains of the Amargosa range behind, Stovepipe Wells, Death Valley National Park, California, United States of America, North America

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

Sandy dunes near Lagoa Bonita (Beautiful lagoon) at Parque Nacional dos Lencois Maranhenses, Brazil, South America

Sandy dunes at Sotovento beach, Jandia Peninsula, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

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

Lagoa Azul (Blue lagoon) and sand dunes, Parque Nacional dos Lencois Maranhenses, Brazil, South America

Ripples in sand dunes at Little Sahara on south coast, Kangaroo Island, South Australia, Australia, Pacific

View across Embleton Bay at low tide towards the ruins of Dunstanburgh Castle, near Alnwick, Northumberland, England, United Kingdom, Europe

Dunes and camp under tree in the distance at Erg Al Hatin, desert trek, Draa Valley, Morocco, North Africa, Africa

Sand dunes on valley floor, Death Valley, California, United States of America (U.S.A.), North America

Sand patterns on the beach at Airbow Point near Kingsbarns on the Fife Coast, Fife, Scotland, United Kingdom, Europe

The Mesquite flat sand dunes in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

The Mesquite flat sand dunes in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

The Mesquite flat sand dunes in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

Footprints and lizard tracks on the Mesquite flat sand dunes in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

The Mesquite flat sand dunes in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

The Mesquite flat sand dunes in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

The Mesquite flat sand dunes in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

The Mesquite flat sand dunes in Death Valley which is the lowest, hottest, driest place in the USA, with an average annual rainfall of around 2 inches, some years it does not receive any rain at all.

Guerro Negro, Mulege, Baja California Sur, Mexico. Sand dunes at sunset along the western coast of the Baja peninsula.

Guerro Negro, Mulege, Baja California Sur, Mexico. Sand dunes at sunset along the western coast of the Baja peninsula.

Guerro Negro, Mulege, Baja California Sur, Mexico. Sand dunes at sunset along the western coast of the Baja peninsula.

Aerial image of rain ponds in between sand dunes, Lencois Maranhenses, Maranhao, Brazil, South America

Freshwater plants in rain water ponds in the middle of sand dunes, Lencois Maranhenses, Maranhao, Brazil, South America

A stranded Svalbard reindeer fawn (Rangifer tarandus platyrhynchus) on ice floe at Monaco Glacier in Wood Fjord, Spitsbergen, Svalbard Archipelago, Norway

A stranded Svalbard reindeer fawn (Rangifer tarandus platyrhynchus) on ice floe at Monaco Glacier in Wood Fjord, Spitsbergen, Svalbard Archipelago, Norway

Adult gentoo penguins (Pygoscelis papua) swimming and on small growlers in Neko Harbour in Andvord Bay, Antarctica

Sunrise or sunset at sea in the Atlantic Ocean from onboard the National Geographic Endeavour crossing the Atlantic Ocean from Lisbon, Portugal to Salvador, Brazil.

Keiko star of 'Free Willy' movie. Orca/killer whale (Orcinus orca). Vestmannaeyjar, Westman Islands), Iceland.

Keiko star of 'Free Willy' movie. Orca/killer whale (Orcinus orca). Vestmannaeyjar, Westman Islands), Iceland.

Fin whale fluke print, or 'foot print', caused by the powerful up stroke of a whale's tail while it is still near the surface (Balaenoptera physalus) . Bay of Biscay, SW (RR)

Adult gentoo penguins (Pygoscelis papua) swimming and on small growlers in Neko Harbour in Andvord Bay, Antarctica

A stranded Svalbard reindeer fawn (Rangifer tarandus platyrhynchus) on ice floe at Monaco Glacier in Wood Fjord, Spitsbergen, Svalbard Archipelago, Norway