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Tourists trekking, Sulphur Lake, Kawah Ijen, Ijen Plateau, island of Java, Indonesia, Southeast Asia, Asia

Athabasca Glacier and Sunwapta Lake, Rocky Mountains, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Rock formation called 'the finger of Allah', Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa

Wave-cut platform, and chalk cliffs, Flamborough South Landing, Yorkshire, England, United Kingdom, Europe

Natural spring, Pamukkale, UNESCO World Heritage Site, Egee region, Anatolia, Turkey, Asia Minor, Asia

View of Parque Nacional de la Caldera de Taburiente from Pico de las Nieves, La Palma, Canary Islands, Spain, Atlantic, Europe

Aerial view of La Graciosa Island volcanoes from El Mirador del Rio, Lanzarote, Canary Islands, Spain, Atlantic, Europe

View of Praia do Conceicao beach and Morro do Pico in the background, Parque Nacional de Fernando de Norohna, Fernando de Noronha, Pernambuco, Brazil, South America

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

Aerial view of the sandy dunes and lagoons, part of Parque Nacional dos Lencois Maranhenses, Brazil, South America

Aerial view of the sandy dunes and lagoons, part of Parque Nacional dos Lencois Maranhenses, Brazil, South America

The crater on Vulcano, Aeolian Islands, UNESCO World Heritage Site, island of Sicily, Italy, Mediterranean, Europe

Fumaroles on the crater edge, island of Vulcano, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

One of three crater lakes at the summit of Kelimutu volcano near Moni, soil chemical creates the unusual colours, island of Flores, Indonesia, Southeast Asia, Asia

View east along crater rim from Orongo ceremonial village of the Rano Kau crater, Easter Island, Chile, Pacific, South America

Entrance to Fingal's Cave, columnar basalt rock, Island of Staffa, Argyllshire, Inner Hebrides, Scotland, United Kingdom, Europe

Uluru (Ayers Rock), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Wastwater with Wasdale Head and Great Gable, Lake District National Park, Cumbria, England, United Kingdom, Europe

Glacial valley, Mickleden and Langdale Pikes on the right, Langdale Pikes, Lake District National Park, Cumbria, England, United Kingdom, Euorpe

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, UNESCO World Heritage Site, Big Island, Hawaiian Islands, United States of America, North America

One of the crater lakes at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Band-i-Zulfiqar, the main lake at Band-E-Amir (Dam of the King), Afghanistan's first National Park set up in 1973 to protect the five lakes, believed by locals to have been created by the Prophet Mohammed's son-in-law Ali, making them a place of pilgrimage, Afghanistan, Asia

Folded limestone and shale, Jurassic period, Stair Hole, Lulworth, Dorset, England, United Kingdom, Europe

Sedimentary rocks, blue lias, shale-limestone sequences, Lyme Regis, Jurassic coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Sedimentary rocks, clay, colour banded by iron oxides, horizontal Triassic Chinle Clay, Blue Mesa, Painted Desert, Arizona, United States of America, North America

Migrating barchan sand dunes across road marked by buried telegraph poles, Kharga basin, Western Desert, Egypt, North Africa, Africa

The world's finest travertine dams, Huanglong (Yellow Dragon), UNESCO World Heritage Site, northern Sichuan, Sichuan, China, Asia

Aerial view of the Iguassu Falls, Iguassu National Park, UNESCO World Heritage Site, Parana, Brazil, South America

The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe

The Giants Causeway, UNESCO World Heritage Site, Co. Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Steam issuing from sulphurous fumarole at Gran Craters, Vulcano Island, with islands of Lipari and Salina beyond, Aeolian Islands (Eolian Islands) (Lipari Islands), UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Band-I-Zulfiqar the main lake, Band-E- Amir (Bandi-Amir) (Dam of the King) crater lakes, Afghanistan's first National Park, Bamian province, Afghanistan, Asia

Tourists inspecting the large halite salt crystal formations, Devils Golf Course, Death Valley National Park, California, United States of America, North America

Waterfall on the Colorado River, Hacienda Guachipelin, near Rincon de la Vieja National Park, Guanacaste, Costa Rica, Central America

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

View of Koh Ping-gan from Koh Ta Poo, known as James Bond island, Phang-Nga Bay, Thailand, Southeast Asia, Asia

Zodiac cruises through a natural arch of columnar basalt on the southern coast of Disko Island, Kuannersuit, Greenland, Polar Regions

Skylight, view through cooled lava to molten lava below, with plumes of steam as lava reaches the sea beyond, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island', Hawaii, United States of America, North America

Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

Limestone pavements near Chapel-le-Dale, Yorkshire Dales, National Park, Yorkshire, England, United Kingdom, Europe

Limestone pavements near Chapel-le-Dale, Yorkshire Dales, National Park, Yorkshire, England, United Kingdom, Europe

Buttertubs potholes, karstic erosion at Buttertubs Pass, between Wensleydale and Swaledale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Buttertubs potholes, karstic erosion at Buttertubs Pass, between Wensleydale and Swaledale, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe