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Looking out through entrance of cave, Deer Cave, Gunung Mulu National Park, UNESCO World Heritage Site, Sarawak, island of Borneo, Malaysia, Southeast Asia, Asia
Champagne Pools steaming, Waiotapu thermal reserve, Rotorua, South Auckland, North Island, New Zealand, Pacific
Cathedral Cove, Coromandel Peninsula, South Auckland, North Island, New Zealand, Pacific
Stratified rock at Agio Pavlos in southern Crete, island of Crete, Greece, Mediterranean, Europe
Smoke billowing out from volcano vent, Sulphur Lake, Kawah Ijen, Ijen Plateau, island of Java, Indonesia, Southeast Asia, Asia
Tourists trekking, Sulphur Lake, Kawah Ijen, Ijen Plateau, island of Java, Indonesia, Southeast Asia, Asia
Aerial view of La Graciosa Island volcanoes from El Mirador del Rio, Lanzarote, Canary Islands, Spain, Atlantic, 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
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
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
Remarkable Rocks, Kangaroo Island, South Australia, Australia, Pacific
View of Koh Ping-gan from Koh Ta Poo, known as James Bond island, Phang-Nga Bay, Thailand, Southeast Asia, Asia
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Water cascading off Rob Roy Glacier, Mount Aspiring National Park, Otago, South Island, New Zealand, Pacific
The Pu'u O'o cinder cone, the active vent on the southern flank of the Kilauea volcano, Big Island, Hawaii, Hawaiian Islands, United States of America, North America
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
The beach and multi-coloured cliffs at Alum Bay, accessible by chairlift, Isle of Wight, Hampshire, England, United Kingdom, Europe
The Remarkable Rocks, weathered layer remnants on a granite dome, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Sand dunes of Maspalomas, Gran Canaria, Canary Islands, Spain, Atlantic, Europe
Eroded calcarenite rock (cemented coral sands) with Mount Lidgbird and Mount Gower by the lagoon with the world's most southerly coral reef, on this 10km long volcanic island in the Tasman Sea, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific Ocean.
Zodiac cruises through a natural arch of columnar basalt on the southern coast of Disko Island, Kuannersuit, Greenland, Polar Regions
Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America
Stratified rock at Agio Pavlos in southern Crete, island of Crete, Greece, Mediterranean, Europe
The crater on Vulcano, Aeolian Islands, UNESCO World Heritage Site, island of Sicily, Italy, Mediterranean, Europe
Da Nort Bank, natural arches and cliffs, Foula, Shetland Islands, Scotland, United Kingdom, Europe
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Steam rising in the Whakarewarewa Thermal Reserve in Rotorua, South Auckland, North Island, New Zealand, Pacific
The Lady Knox Geyser in the Waiotapu Thermal Area at Rotorua, North Island, New Zealand, Pacific
Late winter hikers on Tongariro crossing, Mount Ngauruhoe and South Crater, Taupo, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific
Beach, white chalk cliffs, stacks and arches, Whitianga, Coromandel Peninsula, South Auckland, North Island, New Zealand, Pacific
Champagne Pools steaming, Waiotapu thermal reserves, Rotorua, South Auckland, North Island, New Zealand, Pacific
Remarkable Rocks, Kangaroo Island, South Australia, Australia, Pacific
Christie's Hole, eroded volcanic rock coast of Papa Stour (Great Island of the Priests), Shetland Islands, Scotland, United Kingdom, Europe
Volcanic rock formations on south eastern coast, Kleftiko, Milos, Cyclades islands, Greece, Mediterranean, Europe
Mount Fuji (3776m), Owakidani geothermal park, Hakone, Honshu Island, Japan, Asia
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Hikers near Emerald Lakes on the Tongariro Crossing, Tongariro National Park, UNESCO World Heritage Site, the oldest national park in New Zealand, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Basaltic cliffs dominating Raasay Sound, east coast of Skye, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific
Te Horo rock, Cathedral Cove, Coromandel Peninsula, North Island, New Zealand, Pacific
Isla de los Pescadores in centre, salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America
Aerial view of the interior of the island of Kauai, including Waimea Canyon, Hawaii, United States of America, North America
Sand dunes of Maspalomas and seaside, Gran Canaria, Canary Islands, Spain, Atlantic, Europe
Devils Punchbowl Falls, 131m high, on walking track in mountain beech forest, Arthur's Pass National Park, Southern Alps, Westland, South Island, New Zealand, Pacific
Slea Head, Dingle Peninsula, County Kerry, Munster, Republic of Ireland (Eire), Europe
Plumes of steam where the lava reaches the sea, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, Pacific, North America
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Lake Hawea, 384m deep, Otago, South Island, New Zealand, Pacific
Curved stalactites and wall flowstone of pure salt, in cave in Namakdan salt dome, Qeshm Island, southern Iran, Middle East
Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Late winter hiker on Tongariro Crossing, Mount Ngauruhoe and South Crater, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
Cacti on Isla de los Pescadores, and salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America
Lava flow, Kilauea, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Eshaness basalt cliffs, Calder's Geo, ancient volcanic crater, coast deeply eroded with caves, blowholes and stacks, Northmavine, Shetland Islands, Scotland, United Kingdom, Europe
Sand depressions in the flood plain of the Haast River valley at the start of the main divide, Haast, Westland, South Island, New Zealand, Pacific
Granite rocks at Ile de Coco, Seychelles, Indian Ocean, Africa
Red beach, Akrotiri, island of Santorini (Thira), Cyclades Islands, Aegean, Greek Islands, Greece, Europe
Multi-coloured cliffs on the coast, Alum Bay, Isle of Wight, England, United Kingdom, Europe
Alum Bay, Isle of Wight, England, United Kingdom, Europe
Cinder cones in the centre of the island near Tinajo, a relic of the island's active volcanic past, Lanzarote, Canary Islands, Spain, Atlantic Ocean, Europe
Dormant volcano, Mount Ngauruhoe, Tongariro National Park, UNESCO World Heritage Site, Taupo, South Auckland, North Island, New Zealand, Pacific
Favignana, Egadi Islands, Sicily, Italy, Mediterranean, Europe
Faraglioni Rocks, Capri, Campania, Italy, Mediterranean, Europe
Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America
Fox Glacier, Westland, west coast, South Island, New Zealand, Pacific
Natural bridge, Aruba, Antilles, Central America
Skylight, view through cooled lava to molten lava below, Kilauea Volcano, Hawaii Volcanoes National Park, Island of Hawaii (Big Island', Hawaii, United States of America, North America
Hikers at 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
Snow-capped mountains and steep cliffs of Icy Arm, Baffin Island, Nunavut, Canada, North America
Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific
Na Pali, north coast of the island of Kauai, Hawaii, United States of America, Pacific, North America
St. Ninian's Isle tombolo, connecting St Ninian to Mainland, South Mainland, Shetland Islands, Scotland, United Kingdom, Europe
Rocky Coast and Yesnaby castle, a sea stack, near Yesnaby, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
View of sedimentary layers from Cape Hay, Bylot Island, Nunavut, Canada, North America
Aerial view of peak of Mount Cook, Mount Cook National Park, Southern Alps, Canterbury, South Island, New Zealand, Pacific
Thassos (Thasos), Aegean Islands, Greek Islands, Greece, Europe
Pohutu Geyser at Te Puia Wakarewarewa Geothermal Village, Rotorua, Taupo Volcanic Zone, North Island, New Zealand, Pacific
Hikers walking through a lava field 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
Rocky coast near Yesnaby, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
Black boulder rocks in Talisker Bay, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Algar do Carvao Caves, Terceira Island, Azores, Portugal, Europe
Blue Grotto near Zurrieq, Malta, Mediterranean, Europe
Kilauea volcano crater showing solidified ropy lava called pahoehoe, The Big Island, Hawaii, Hawaiian Islands, United States of America, North America
Yesnaby Castle sea stack, rock eroded by the sea, Mainland, Orkney Islands, Scotland, United Kingdom, Europe
Rocky east coast of Trotternish and passing boat, Raasay in the background, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Black boulder rocks in Talisker Bay, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe
Volcanic rocks and beach at Paleokori, southern coast, Milos, Cyclades islands, Greece, Mediterranean, Europe
Bromo-Tengger-Semeru National Park at dawn, island of Java, Indonesia, Southeast Asia, Asia
Elephant rock, Castelsardo, Sassari province, island of Sardinia, Italy, Mediterranean, Europe
Hot steam, Craters of the Moon Thermal Area, Taupo, North Island, New Zealand, Pacific
Staffa, Inner Hebrides, Argyll and Bute, Scotland, United Kingdom, Europe
Cascade Terrace at Orakei Korako Thermals in the North Island of New Zealand, Pacific
Volcano cone viewed from la Dehesa, with sea beyond, El Hierro, Canary Islands, Spain, Atlantic, Europe
Basaltic cliffs dominating Raasay Sound, east coast of Skye, Trotternish, Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe