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Victoria Falls, UNESCO World Heritage Site, Zambesi River, on the border of Zambia and Zimbabwe, Africa

Misty morning on Hoe Lake, Boundary Waters Canoe Area Wilderness, Superior National Forest, Minnesota, United States of America, North America

Canoeing on Hoe Lake, Boundary Waters Canoe Area Wilderness, Superior National Forest, Minnesota, United States of America, North America

Canoeing on the Louse River, Boundary Waters Canoe Area Wilderness, Superior National Forest, Minnesota, United States of America, North America

Loch an Eilein, near Aviemore, Cairngorms National Park, Highlands, Scotland, United Kingdom, Europe

Scots Pine forest and Lui Water, Deeside, near Braemar, Cairngorms National Park, Aberdeenshire, Scotland, United Kingdom, Europe

On the Trail with Pack Mules transporting gear to Kyanjin Gompa, Langtang Valley trek, Himalayas, Nepal, Asia

View from Nebelhorn summit to Allgau Alps, Oberstdorf, Swabia, Bavarian Alps, Bavaria, Germany, Europe

View from Eisenberg Castle ruin to Tannheim Mountains, Pfronten, Allgau, Swabia, Bavaria, Germany, Europe

View from Nordwandsteig walk on Nebelhorn Mountain, 2224m, to Entschenkopf Mountain, 2043m, Oberstdorf, Swabia, Bavarian Alps, Bavaria, Germany, Europe

The Majestic Tserko Ri Peak overlooking the Upper Langtang valley on the Langtang Valley trek, Himalayas, Nepal, Asia

Close-up of a Horned Yak and mountainous backdrop on the Langtang Valley trek, Himalayas, Nepal, Asia

Tinh Yeu (Love Waterfall) in the jungle near Sa Pa (Sapa), Lao Cai province, Vietnam, Indochina, Southeast Asia, Asia

Lone stupa (chorten) in vast high altitude valley, Kyanjin Gompa, Langtang Valley trek, Himalayas, Nepal, Asia

Nepali porter carries a heavy load using traditional wicker basket and tump headband in the lower Hingku Valley, close to Lukla and Mount Everest, Khumbu region, Himalayas, Nepal, Asia

Rock climber tackles a very overhanging route on the famous limestone cliffs of the Gorge du Tarn in the Massif Central, near Millau and Rodez, south west France, Europe

Climber makes a solo ascent of one of the thousands of classic outcrop climbs on the popular cliff of Stanage Edge, near Hathersage, Peak District, Derbyshire, England, United Kingdom, Europe

Two rock climbers making their way up a very difficult route on the 450 metre monolith of Karimbony, Tsaranoro Massif, Andringitra National Park, Southern Madagascar, Africa

A hiker enjoys solitude in the hills above Hay-on-Wye, on the eastern edge of the Brecon Beacons National Park, Monmouthshire, Wales, United Kingdom, Europe

A rock climber ascends slabs at the base of the huge cliff known as The Apron, overlooking Washington Column and North Dome, Yosemite Valley, California, United States of America, North America

Semi-wild Orang Utan (Pongo pygmaeus) at Semengok Orangutan Sanctuary and Rehabilitation Centre, Kuching, Malaysian Borneo, Malaysia, Southeast Asia, Asia

The Zanskar Range of the Indian Himalaya seen from the air, looking north west towards the western Karakorum mountains and K2 in the distance, India, Asia

The light of the setting sun illuminates the unusual architecture of Blackchurch Rock, which lies under cliffs between Clovelly and Hartland Point, Culm Coast, North Devon, England, United Kingdom, Europe

The light of the setting sun illuminates the unusual architecture of Blackchurch Rock, which lies under cliffs between Clovelly and Hartland Point, Culm Coast, North Devon, England, United Kingdom, Europe

A climber moves along the steel cables on the Fressinieres via ferrata, above the Fressinieres valley, near Briancon, Ecrins Massif, western Alps, Hautes-Alpes, south east France, Europe

A climber tackles a very difficult route on the rock known as Dromadaire (The Dromedary) by the Tarn river, Gorges du Tarn, near Millau and Rodez, Massif Central, south west France, Europe

A climber on the cliffs known as the Tennessee Walls, high above the Tarn river and home to some of the most spectacular pitches of rock climbing in Europe, Gorges du Tarn, near Millau and Rodez, Cevennes region, south west France, Europe

A trekker heads up into the wilderness of the highest part of the Ecrins Massif in deep winter snow, above the village of Pelvoux, near Briancon, western Alps, Hautes Alpes, south west France, Europe

A climber tackles an exceptionally difficult, F8c graded, route on a big overhang at the cliffs of Margalef, underneath Montsant, near Lleida and Tarragona, Catalunya, Spain, Europe

A snowboarder enjoys superb spring snow high on the famous Valley Blanche ski run, one of the world's most celebrated glacier descents, with Mont Blanc Du Tacul in the distance, Mont Blanc, Chamonix, western Alps, France, Europe

A climber walks towards advanced base camp at 5800 metres on Mera Peak, 6420 metres, a popular trekking peak in the Khumbu region, with Mount Everest beyond, Nepal Himalaya, Nepal, Asia

A porter crosses a river using a fallen log whilst carrying a heavy load up the Hingku Valley, near Lukla, south of Mount Everest, Nepal Himalaya, Nepal, Asia

A climber on a popular gritstone bouldering route on the Plantation Boulders at Stanage Edge, Peak District National Park, near Hathersage, Derbyshire, England, United Kingdom, Europe

Sawtooth Lake, Sawtooth Mountains, Sawtooth Wilderness, Sawtooth National Recreation Area, Rocky Mountains, Idaho, United States of America, North America

Sawtooth Lake, Sawtooth Mountains, Sawtooth Wilderness, Sawtooth National Recreation Area, Rocky Mountains, Idaho, United States of America, North America

Dawn over Sawtooth Lake, Sawtooth Mountains, Sawtooth Wilderness, Sawtooth National Recreation Area, Rocky Mountains, Idaho, United States of America, North America

Expansive Southwest Panorama from Kyanjin Ri Summit Featuring the Snowy Ridges of Naya Kanga (Ganja La Peak) and the Surrounding Langtang Range in Nepal

Spectacular View of Gangchempo Glaciated Pyramid Rising Above Snowy Slopes from Kyanjin Ri Summit in the Langtang Valley, Nepal

A broadclub cuttlefish (Sepia latimanus) lays eggs in a coral colony in Komodo National Park, Indonesia.

A beautiful nudibranch (Halgerda batangas) crawls on the sandy seafloor of Lembeh Strait, Indonesia. Lembeh Strait is known for its diverse array of bizarre marine organisms.

A tiny cleaner shrimp removes parasites from a Black-finned snake eel (Ophichthus cephalozona) on a sandy seafloor in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A slightly bleached staghorn coral colony grows in shallow water in the Solomon Islands. This Melanesian region is known for its spectacular marine biodiversity.

Fragile, foliose corals grow on a beautiful reef slope in Raja Ampat, Indonesia. This remote, equatorial region is known as the heart of the Coral Triangle. It is a popular destination for scuba divers and snorkelers.

A school of big-eye jacks (Caranx sexfasciatus) above a coral reef in the Solomon Islands. This region is known for its healthy fish populations.

Blacktip reef sharks swim just under the surface in the Solomon Islands. This beautiful Melanesian region is known for its spectacular reefs and high marine biodiversity.

Detail of anchor coral tentacles (Euphyllia sp.) growing on a reef in Indonesia. This area is known for its high marine biodiversity.

Soft leather corals grow in the shallow waters in the Solomon Islands, Melanesia. This region, in the eastern part of the Coral Triangle, harbors spectacular marine biodiversity and is known for its beautiful reefs.

A large reef manta ray (Mobula alfredi) swims through clear water in Raja Ampat, Indonesia. This beautiful region is known as the heart of the Coral Triangle and is a popular destination for scuba divers and snorkelers.

Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.

A pair of colorful tunicates grows on a reef in Lembeh Strait, Indonesia. This is a filter-feeding organism.

A Clark's anemonefish (Amphiprion clarkii) snuggles amongst its host's tentacles on a reef in Lembeh Strait, Indonesia.

A thorny seahorse (Hippocampus histrix) uses effective camouflage to blend into its surroundings on the seafloor of Lembeh Strait, Indonesia.

A hawksbill sea turtle swims over a coral reef in Palau. This is an endangered species often hunted for its shell and meat.

False clownfish (Amphiprion ocellaris) swim near their host anemone in Alor, Indonesia. This remote region is known for its beautiful reefs and spectacular marine biodiversity.

Beautiful soft coral colonies grow on a healthy coral reef in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Rugged limestone islands surround a gorgeous lagoon in a remote part of Raja Ampat, Indonesia. This beautiful region is known as the heart of the Coral Triangle and is a popular destination for scuba divers and snorkelers.

A beautiful coral reef grows near a set of limestone islands in Raja Ampat, Indonesia. This remote, equatorial region is known as the heart of the Coral Triangle. It is a popular destination for scuba divers and snorkelers.

Forest-covered limestone islands surround a gorgeous lagoon in a remote part of Raja Ampat, Indonesia. This beautiful region is known as the heart of the Coral Triangle and is a popular destination for scuba divers and snorkelers.

A Japanese Jake seaplane, shot down during World War II, lies on the seafloor of Palau's lagoon. Many planes and dozens of large ships were sunk around Palau during the war.

A Japanese Jake seaplane, shot down during World War II, lies on the seafloor of Palau's lagoon. Many planes and dozens of large ships were sunk around Palau during the war.

A Caribbean electric ray (Narcine bancroftii) lays on the sandy seafloor of Turneffe Atoll off the coast of Belize in the Caribbean Sea. This ray can generate strong electric discharges used to defend themselves or to stun prey.

Fragile corals grow in extremely shallow water in Komodo National Park, Indonesia. This part of the Coral Triangle is known for its high marine biodiversity and is a popular destination for scuba divers and snorkelers.

A West Indian starfish (Oreaster reticulatus) crawls slowly across a sand and seagrass seafloor in Turneffe Atoll, Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

A West Indian starfish (Oreaster reticulatus) crawls slowly across a sandy seafloor in Turneffe Atoll, Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

A West Indian starfish (Oreaster reticulatus) crawls slowly across a sand and seagrass seafloor in Turneffe Atoll, Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

A diverse array of corals grow in Raja Ampat, Indonesia. This beautiful region is known for its spectacular reefs and high marine biodiversity.

Colorful gorgonians and reef-building corals grow in shallow water near the famous Blue Hole in Belize. This part of Central America is well known for its clear waters and beautiful coral reefs.

A Clark's anemonefish (Amphiprion clarkii) snuggles amongst its host's tentacles on a reef in Lembeh Strait, Indonesia.

A beautiful nudibranch (Hypselodoris bullockii) crawls slowly across a reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A beautiful set of tiny tunicates grows on a reef in Indonesia.This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Vibrant soft coral colonies grow on a reef dropoff in Lembeh Strait, Indonesia. This area is known for its spectacular marine biodiversity.

A pair of spotted eagle rays (Aetobatus narinari) swim over the deep, sandy seafloor near Cocos Island, Costa Rica. This remote, Pacific island is famous for its healthy fish and shark populations.

A spotted eagle ray (Aetobatus narinari) swims over the deep, sandy seafloor near Cocos Island, Costa Rica. This remote, Pacific island is famous for its healthy fish and shark populations.

Reef-building corals thrive in shallow water in Raja Ampat, Indonesia. This remote region is known for its beautiful reefs and spectacular marine biodiversity.

Blue starfish (Linckia laevigata) cling to a coral bommie in Indonesia. This species of seastar is common throughout the Indo-Pacific.

Delicate corals grow on a shallow reef near the island of Flores in Indonesia. This beautiful region is known for its spectacular reefs and high marine biodiversity.

Corals grow on a shallow reef in Indonesia. This beautiful, tropical region is known for its spectacular reefs and high marine biodiversity.

Coral polyps (Galaxea sp.) wait for plankton on a reef in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A bulbed anemone (Entacmaea quadricolor) grows on a reef in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A Clark's anemonefish (Amphiprion clarkii) snuggles into the tentacles of its host anemone in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A pair of robust ghost pipefish (Solenostomus cyanopterus) hover above the seafloor in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

A beautiful starfish (Linckia laevigata) lays on a thriving reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.