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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

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 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.

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.

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 rare roughsnout ghost pipefish (Solenostomus paegnius) hovers above the seafloor in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A live sundial shell (Architectonica perspectiva) crawls across the seafloor in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Fast-growing corals (Acropora sp.) are being grown by scientists in the Caribbean Sea. Once they reach a certain size they will be planted on a reef that has been previously damaged.

Lily pads grow along the shallow edge of a freshwater lake in New England. Aquatic vegetation, which thrives during summer months, provides vital habitat for many fish, amphibians, and reptiles.

Limestone islands surround a beautiful lagoon in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

A colorful and healthy coral reef thrives in shallow water in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

Colorful chocolate chip starfish lie scattered on the floor of a seagrass meadow in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

A beautiful coral reef thrives in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for both its amazing marine biodiversity as well its infamous dragons.

A bleached magnificent sea anemone is found on a reef off the coast of Sulawesi in Indonesia. Bleaching is usually associated with higher than normal sea temperatures.

A well-camouflaged tasselled wobbegong, Eucrossorhinus dasypogon, lies on the seafloor in Raja Ampat, Indonesia.

A spotted porcelain crab, Neopetrolisthes maculatus, snuggles into its host anemone in Komodo National Park, Indonesia.

Mushroom shaped sandstone spire on an eroded ridge west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Aerial view of Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Panoramic view over the Elbe River meander from the Konigstein fortress on top of the Elbe sandstone mountains, Konigstein, Saxony, Germany, Europe

Icebergs near the Antarctic Peninsula during the summer months, Antarctica, Southern Ocean, Polar Regions

The upper half of the Desert View Watchtower viewed from the observation deck at Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

Lindblad Expeditions guests explore Cape Flora on Northbrook Island in Franz Josef Land, Russia, Arctic Ocean, Eurasia

Snow-capped peaks and lush valleys at sunset showcased in a stunning landscape, Kyrgyzstan, Central Asia, Asia

Aerial view taken by drone of Skyggnisvtn lake in Landmannalaugar area, during a summer day, Iceland, Polar Regions

Around the village of Masca in the Teno mountain massif, Tenerife, Canary Islands, Spain, Atlantic Ocean, Europe

Towering red rock formations in the Warton Sandstone, King George River, Kimberley, Western Australia, Australia, Pacific

Views of Austfonna, an ice cap located on Nordaustlandet in the Svalbard archipelago in Norway, Arctic, Europe

View of signpost in Longyearbyen on the island of Spitsbergen in the Svalbard Archipelago, Norway, Arctic, Europe

Black and whilte image of an Atlantic Puffin (Fratercula arctica), after having jumped from a cliff edge in Borgarfjaroarhofn, Iceland, Polar Regions

The Trotternish Ridge north of the Quiraing, a major geological feature of lava flows over Jurassic sediments, a major scenic attraction in the far north east of the island, Flodigarry, Trotternish Peninsula, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Small waterfall on the Lonfearn Burn near Brothers' Point (Rubha nam Brathairean) the easternmost point of the Trotternish, Brothers' Point, Trotternish Peninsula, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Guest from the Lindblad Expeditions ship National Geographic Sea Bird behind a mushroom or toadstool in Southeast Alaska, United States of America, North America

Weddell Seal (Leptonychotes weddellii), hauled out on ice at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

View over the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of a red sailing boat in the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

A waterfall backlit by the midday sun, in a gorge in Bossiney Haven, near Tintagel, Cornwall, England, United Kingdom, Europe

Alpine waterfall along the Ptarmigan Cirque Trail in summer, Mount Arethusa, Kananaskis Country, Alberta, Canadian Rockies, Canada, North America

Naji Ravine just south of Naji Point on the North Rim of Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Looking up at the steep red cliffs from the suspension bridge in the gorge of Los Cahorros Monachil, Monachil, Sierra Nevada, Granada, Andalusia, Spain, Europe

Cliff views from the edge of Naji Point on the North Rim of Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Helicopter bringing guests to New Island in the Falkland Islands, South Atlantic Ocean, South America

Cheetah (Acinonyx jubatus) among Devil's thorn flowers, Kgalagadi Transfrontier Park, Northern Cape, South Africa, Africa