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Footsteps in the sand on the Dune du Pyla, the largest dune in Europe, Bay of Arcachon, Cote d'Argent, Gironde, Aquitaine, France, Europe

Erratic in tidal pool on isle of Taransay, looking towards Toe Head on South Harris, Outer Hebrides, Scotland, United Kingdom, Europe

View towards Luskentyre and the hills of North Harris from Isle of Taransay, Outer Hebrides, Scotland, United Kingdom, Europe

View along the tidal causeway to St. Mary's Island and St. Mary's Lighthouse at dusk, near Whitley Bay, Tyne and Wear, England, United Kingdom, Europe

View along the tidal causeway to St. Mary's Island and St. Mary's Lighthouse at dusk, near Whitley Bay, Tyne and Wear, England, United Kingdom, Europe

A rainbow appears looking east across the granite mountains of the Andringitra National Park, as a squall of rain blows in from the Indian Ocean, Southern Madagascar, Africa

A climber on the classic extreme route Raven Wall on the cliffs at Bosigran, near St. Just, West Penwith, Cornwall, England, United Kingdom, Europe

A climber hangs above the sea on the huge west face of Dun Mingulay cliff, Mingulay Island, Outer Hebrides, Scotland, United Kingdom, Europe

Studland Beach and The Foreland or Hardfast Point, showing Old Harry Rock, Isle of Purbeck, Dorset, England, United Kingdom, Europe

A walker stands on a boulder beside the isolated Bear Rock, a Culm pinnacle near Hartland Quay, Culm Coast, North Devon, England, United Kingdom, Europe

Fishermen make their way home in canoes as the sun sets over Nigeen Lake, Srinagar, capital of Indian-administered Kashmir, India, Asia

A climber deep water soloing above the sea on the limestone cliffs near St. Govan's Head, South Pembrokeshire, Pembrokeshire Coast National Park, Wales, United Kingdom, Europe

A climber deep water soloing above the sea on the limestone cliffs near St. Govan's Head, South Pembrokeshire, Pembrokeshire Coast National Park, Wales, United Kingdom, Europe

Old Harry Rocks, The Foreland or Handfast Point, Studland, Isle of Purbeck, Dorset, England, United Kingdom, Europe

Old Harry Rocks, The Foreland or Handfast Point, Studland, Isle of Purbeck, Dorset, England, United Kingdom, Europe

Spring wildflowers on the clifftops overlooking Bedruthan Steps, North Cornwall, England, United Kingdom, Europe

The Danube River flowing through the Kazan Gorge in the Iron Gates Region between Serbia and Romania, Europe

Sea lions (Otaria flavescens) in the Beagle Channel, Ushuaia, Tierra del Fuego, Patagonia, Argentina, South America

Sea lions (Otaria flavescens) in the Beagle Channel, Ushuaia, Tierra del Fuego, Patagonia, Argentina, South America

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

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.

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.

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 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 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.

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

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.

A venomous scorpionfish is found 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.

Soft corals, sponges, and other invertebrates compete for space on a beautiful reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Crinoids cling to a large sponge on a healthy coral reef near the island of Sulawesi, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

An unusual sea star (Linckia laevigata) clings to a diverse reef near the island of Bangka, Indonesia. This beautiful, tropical region is home to an incredible variety of marine life.

A colorful set of gorgonians, reef-building corals, and other invertebrates grow on a diverse reef in the Caribbean Sea.

A colorful set of gorgonians, reef-building corals, and other invertebrates grow on a diverse reef in the Caribbean Sea.

A shallow coral reef thrives in Wakatobi National Park, Indonesia. This remote region is known for its incredible marine biodiversity and gorgeous reefs.

A large mantis shrimp (Lysosquilla sp.) uses its excellent eyesight to scan its underwater environment in the Lesser Sunda Islands of Indonesia.

A broadclub cuttlefish (Sepia latimanus) hovers above a beautiful coral reef in Komodo National Park, Indonesia.

A broadclub cuttlefish (Sepia latimanus) hovers above a beautiful coral reef in Komodo National Park, Indonesia.

A young hawksbill sea turtle (Eretmochelys imbricata) has found a quiet place to sleep in Komodo National Park, Indonesia.

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.

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 broadclub cuttlefish (Sepia latimanus) uses camouflage to blend into a shallow coral reef in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim above a beautiful set of corals growing near Alor in the Lesser Sunda Islands of Indonesia.

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim above a healthy reef in the Lesser Sunda Islands of Indonesia.

Colorful reef fish, mainly Scalefin anthias (Pseudanthias squamipinnis), swim in a strong current near Alor in the Lesser Sunda Islands of Indonesia.

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of the Blue Hole in Lighthouse Reef in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

A beautiful coral reef thrives in the shallows of Alor, Indonesia. This remote region is home to a wide array of marine biodiversity.

A beautiful coral reef, dominated by colorful gorgonians, grows along the edge of Turneffe Atoll in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

Soft coral colonies, Sinularia sp., thrive on a reef found among the remote, tropical islands of Raja Ampat, Indonesia.

A discarded plastic bag drifts underwater amid the remote, tropical islands of Raja Ampat, Indonesia. Plastics break into tiny pieces that eventually enter the food web.

Rugged and remote, limestone islands rise around a beautiful lagoon seascape in Raja Ampat, Indonesia. This region is known as the heart of the Coral Triangle due to its incredible marine biodiversity. It is a popular destination for scuba divers and snor

Bright beams of sunlight descend into the shadows of a blue water mangrove forest in Raja Ampat, Indonesia.

Discarded plastic bags and other trash float above a shallow coral reef in Raja Ampat, Indonesia. Plastics have become a major pollution problem worldwide.

Vivid Golden and Orange Sand Meeting Turquoise Water Under Clear Blue Sky at Abel Tasman National Park, New Zealand

Aerial view of a healthy fringing reef along the edge of Komodo Island in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for its marine biodiversity as well as its infamous Komodo dragons.

Aerial view of the idyllic island of Gili Banta just outside of Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for its marine biodiversity as well as its infamous Komodo dragons.

A bird's eye view shows the rugged landscape of Komodo Island in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for its marine biodiversity as well as its infamous Komodo dragons.

A bird's eye view of an idyllic island and healthy fringing reef in Komodo National Park, Indonesia. This tropical area in the Lesser Sunda Islands is known for its marine biodiversity as well as its infamous Komodo 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.